There is a popular question, called "Best statistics question ever".
If you choose an answer to this question at random, what is the chance you will be correct?
A) 25% B) 50% C) 60% D) 25%
This task is not very difficult, the correct answer is 0%. But if we modify it like this:
If you choose an answer to this question at random, what is the chance you will be correct?
A) 50% B) 25% C) 60% D) 50%
What will be the correct answer? Do we have two correct answers: 25% and 50%, or there is no correct answer, as with these two correct answers the chance of choosing the correct answer is in fact 75% (but we do not have 75% written on the desk)?
By the way. Does the answer 0% remains the correct answer, the third correct answer in this case?