## What is the Chance That You’ll Be Correct?

If you choose an answer to this question at random, what is the chance that you will be correct?

a) 25%

b) 50%

c) 60%

d) 25%

This is becomes a self-referential paradox. Both A and D would be correct if there were four unique answers, but since A and D are the same answer, the chance that you would choose a correct answer is 50%, which makes B correct. But if there’s only one correct answer, the odds of choosing the correct one at random goes back to 25%. And around and round you go.

There’s a lot of discussion at Richard Wiseman’s blog and more at Lifehacker, where I first saw this.

Posted in Brain Teasers

12 Comments on "What is the Chance That You’ll Be Correct?"Dorf Kaffl says

April 19, 2014 @ 12:18

can’t find the answer

Dan says

April 19, 2014 @ 21:09

Click on “Show the answer”

Joey says

August 15, 2014 @ 19:52

The answer is 0%. None of the answers are correct, so it is impossible to get the question right.

Joey says

February 26, 2015 @ 19:05

The answer is 0% because of the answer choices are wrong.

Joey says

February 26, 2015 @ 19:05

The answer is 0% because all of the answer choices are wrong.

(Sorry, typo)

Karateash says

April 29, 2016 @ 16:38

Joey isn’t right because 25 out of 100 times u will get the answer right so yea don’t believe him

Karateash says

April 29, 2016 @ 16:39

Lol

Karateash says

April 29, 2016 @ 16:40

OMG I love comments

Rob says

August 3, 2016 @ 08:53

Joey is correct because if one one the answers was 33 percent two were 25 and one was 50 then 33 percent would be the correct answer, but since it’s not then Joey is right. There is no right answer. Go Joey :)

Rob says

August 3, 2016 @ 09:09

No I was wrong, Joey is still right though. If your are given the right answer as a choice in one out of four, it would be 25 percent chance no matter what, And one of the answers would have to be 0 then you would have a 25 percent chance. But as I see there is no right answer. Wow! Great Riddle, Lol!

Mohammed says

October 30, 2016 @ 04:34

From the first part of the question:

If you choose an answer to this question at random.

1- the question is not mentioned, so we actually do not know the correct answer.

2-the person who is going to answer randomly is the reader of the question ( got that from *If you choose*)

From the second part of the question:

what is the chance that you will be correct?

and he gave four options:

a) 25%

b) 50%

c) 60%

d) 25%

Ask your selves, to a question you don not know the answer to, and you have these options above.

what are the percentages you will thinking of to answer the question?

for sure it is 25%,50% and 60%.

if you would be wondering what is correct choice A or choice D, then you to get your self checked.

finally the chance of choosing the correct answer from 3 choices is 33.33%

let us try another method.

you have 4 choices:

a) 25%

b) 50%

c) 60%

d) 25%

and if try it 100 times,

if the answer is 25% then 50 out of 100 will be right>>> 50%

if the answer is 50% then 25 out of 100 will be right>>>25%

if the answer is 60% then 25 out of 100 will be right>>>25%

50%+25%+25% = 100

How to Find the Mean

The mean is the average of the numbers.

It is easy to calculate: add up all the numbers, then divide by how many numbers there are.

so 50+25+25= 100

100/3= 33.33%

Medha says

August 20, 2017 @ 03:26

25%

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