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Rob Rule

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23rd May, 2010 at 12:07:29 -

What's the probability of picking the right answer to this question at random?

A. 25% B. 50% C. 0% D. 25%


 
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23rd May, 2010 at 14:00:35 -

What are the options? 25%, 0%, and 50%. Well, it's not 0%, assuming one of the answers is real. So that leaves 25% and 50%. There are two options, and a one in two chance of picking the right one.

B.

Oh but wait, no. "At random". So it's gotta be 25%, if I'm not allowed to use logic, and if A could be considered wrong while D could be considered right (and vice versa).

It's a good thing I don't have any classes today that will require the use of my now-melted brain.

Edited by OMC

 

  		
  		

Marko

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23rd May, 2010 at 21:21:32 -

0%

 
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23rd May, 2010 at 21:41:58 -

None of the listed answers.

can't be 25% as there's two answers making the probability 50%, but also can't be 50% because there's only one of those so there's a 25% of chosing 50% for the answer.

0% is also wrong because there is a 25% chance of you picking c, 0%, at random as the correct answer.

 
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23rd May, 2010 at 21:55:22 -

...i mean't "there's zero percent getting it right with these answers", not the option 0% - i should have just typed that!

 
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Box Blue
23rd May, 2010 at 23:13:03 -

so c then? as 0% is the answer that coresponds to c

I was just thinking on paper so to speak haha

 
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Rob Rule

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23rd May, 2010 at 23:24:31 -

Well exactly. Please treat it like every other multiple answer question ever - one answer is right.

Also, on the post above: if the answer were C, and thus true, how can the answer be 0%?

 
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23rd May, 2010 at 23:26:35 -

The right answer to what question?

 
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23rd May, 2010 at 23:36:20 -

Okay i say C because there are 2 out of 4 answers saying "25%" (i.e. A. and D.), which means there is a 50% chance of getting the correct answer (i.e. option B. in other words). Since it's impossible to pick all of answers A., B. and D., i an going to say your chances are zero, or "0%" (i.e. answer C.)

Or am i talkings balls?

 
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Box Blue
24th May, 2010 at 00:17:19 -


Originally Posted by Rob Rule
Well exactly. Please treat it like every other multiple answer question ever - one answer is right.

Also, on the post above: if the answer were C, and thus true, how can the answer be 0%?



Err I believe i gave my reasoning for C being incorrect if you read my post...? Logically it's impossible. So if it was an exam I just wouldn't circle anything haha.

Edited by Mkingy

 
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Rob Rule

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24th May, 2010 at 01:58:39 -

Don't worry, I read your post, I was continuing on from it.

 
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Box Blue
24th May, 2010 at 09:56:51 -


Originally Posted by Rob Rule
Don't worry, I read your post, I was continuing on from it.



Yes you did My bad I didn't read yours properly however, I thought you were telling people to treat it like a normal multiple choice Sorry ^^,

 
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24th May, 2010 at 18:25:47 -

1 out of 4

or

2 out of 4

depending on which answer is correct.

 
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Jenswa

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24th May, 2010 at 18:48:13 -

Problem solved by previous post, since the odds aren't equally distributed.

 
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Muz



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27th May, 2010 at 21:42:16 -

C is out, because it's wrong and is wrong even if it's right.
A, B, C then. If it's 33%, then that would be right, but it's not 33%.

I'd say it's either B or A/D, since A/D are the same.
So, assuming I pick it out of those two choices, it'd be B.
But then A/D would also be at 25%

Random chances:
50% of picking B
50% of picking A OR D
> 50% of 50% of picking A
> 50% of 50% of picking D

So, A, B, and D are all correct. You never said that there's only one right answer to the question.
Also, you never mentioned what random algorithm you're using

 
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Marko

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28th May, 2010 at 19:17:58 -

Any chance you can put me out my misery with giving us the real answer Rob?

 
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28th May, 2010 at 20:39:50 -

There is no answer.

You're all looking at it as if the question already has a numerical answer, and you are trying to pick it. Truth is, the true probability of picking a "25%" answer is 1/2 and the probability of getting the "50%" or the "0%" answer is 1/4, the "number" given in those choices does not correspond to anything. It becomes clearer if you replace the answers "25%" and "50%" with any other random number, or even a piece of text, as they are red herrings. If I say "What's the probability of picking the answer to this question at random?" and give the answers A. Cow B. Chicken C. 0% D. Frog - it still makes as much logical sense as the original question. The existence of the 0% answer makes the whole thing invalid.

 
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30th June, 2010 at 00:41:06 -

Sorry if this is reviving an old topic, but I only just now seen this so it's new to me and ....
You're all wrong ... so very very wrong. And so very very right too ... yes you're right no matter what you picked.

The probability of picking the right answer to this question at random IS (drum roll) ... 100 percent.
Yes, that's right .. it's 100 percent chance of a random pick ... whether you've come to the conclusion through some logical means that you've worked out or just guessed, it's a 100 percent chance that it will be random because there is no question that requires an answer.

But since there is no 100 percent option ... you could look at it another way and say 50 percent because half will choose probably choose randomly, and half will choose by the use of some logic system. Of course, that logic system is still based upon a random thought using the base of all your knowledge as a part in the random number generation formula.

100 percent chance of a random right answer because every answer can be right if looked at in the right way.

100% is the answer.



 
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8th July, 2010 at 15:06:38 -

There are no correct answers. It's an illogical question.

Assume 0% is the correct answer to the question, then it's a contradiction because there would indeed be a 25% chance of picking C at random.

Assume 25% is the correct answer to the question, then it's a contradiction because there would be a 50% chance of picking A or D at random.

Assume 50% is the correct answer to the question, then it's a contradiction because there would only be a 25% chance of picking B at random.

(It can't be 100% because 100% is not a choice. There is a 0% chance of of picking 100% as an answer, which contradicts your claim that it is actually 100%. The answer is defined in terms of the question, and there are no configurations that don't contradict themselves).

Edited by ~Matt Esch~

 
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8th July, 2010 at 18:39:04 -

b. I just randomly guessed.

 
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8th July, 2010 at 19:37:14 -


Originally Posted by MBK
The probability of picking the right answer to this question at random IS (drum roll) ... 100 percent.
Yes, that's right .. it's 100 percent chance of a random pick ... whether you've come to the conclusion through some logical means that you've worked out or just guessed, it's a 100 percent chance that it will be random because there is no question that requires an answer.


Um, no. Just because it is a 100% chance of a random pick, doesn't mean that you have a 100% chance of getting it right at random, because one doesn't necessitate the other. You could pick an answer randomly and get it wrong. The part I bolded doesn't address the question.


Originally Posted by Muz
So, A, B, and D are all correct. You never said that there's only one right answer to the question.


No, because the question says "the" right answer, without using /s at the end of the word answer. As said, 0% likely wouldn't be correct because to choose one randomly should statistically give it as much chance as any other answer and if it were correct it would contradict that. A and D are the same so one couldn't be more correct than the other, and that's all I have to say on this.

 
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8th July, 2010 at 21:16:00 -

this is like one of those retarded "find the error" questions where the answer ends up being the irrelevant grammar errors in the question itself and has nothing to do with the arbitrary numbers in the example provided.

 
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10th July, 2010 at 22:57:08 -

Assuming you are asking the question to a human, the answer is 0%. It is not possible for a human to pick a number at random. There is always some reason behind the choices we make, whether we understand them or not.

 
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Rob Rule

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11th July, 2010 at 03:43:08 -

It's just a variant of the classic paradox, I'm afraid. But peoples' theories and (flawed?) reasoning are always much more interesting than the answer. If an answer were to be made, it'd be

A. "B"
B. "A"


Edited by Rob Rule

 
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11th July, 2010 at 03:48:32 -

Does this signal the end?

I do hope so.

 

  		
  		

Rob Rule

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11th July, 2010 at 04:15:31 -


Originally Posted by OldManClayton
Does this signal the end?



Yep.

I mean NO. >=D

Three Clickers A, B and C are called, in some order, True, Untrue and Random. True always speaks truly, Untrue always speaks falsely, but whether Random speaks truly or falsely is a completely random matter. Your task is to determine the identities of A, B and C by asking three yes-no questions; each question must be put to exactly one Clicker. You choose the questions; any that you'd like. The Clickers understand English, but will answer all questions in their own fictional language, in which the words for 'yes' and 'no' are 'boo' and 'bah', in some order. You don't know which word means which.

*It could be that some Clicker gets asked more than one question.
*What the second question is, and to which Clicker it's put, may depend on the answer to the first question.
*Whether Random speaks truly or not should be thought of as depending on the flip of a coin hidden in his brain: if the coin comes down heads, he speaks truly; if tails, falsely.
*Random will answer 'da' or 'ja' when asked any yes-no question.

Aim for the three questions, but be aware that it is possible to solve the problem in two questions (very tricky indeed).

Edited by Rob Rule

 
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11th July, 2010 at 04:37:34 -

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MBK



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13th July, 2010 at 22:51:07 -

There IS a real answer and I've finally figured out the riddle.

It's C.) 0%

There's a 0% chance of picking the right answer to this question at random!
Because the answer is to think about the question and not be random!
So if you're just randomly picking something, then you're wrong!




 
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