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0, because the other 3 are mathematically impossible:
if there are two answers that are 25%, it cannot be the right choice, because then it would be either a 33% or 50% chance, depending on whether both the other answers were possible or just one.
if one is 50 and the other is 0, you know it cannot be 50 since 0 is impossible to get as an answer. unless, none of the answers are correct. but there's no 100% chance, so 0 demonstrates that there is no possible answer given.
provided I am right, how would this be demonstrated in an equation?
