Thread: Probability teaser View Single Post
 P: 78 None assumptions: Spoiler -"random" means our choice is a uniformly distributed random variable -the problem can have at most one correct answer even if it is stated by many possible choices (for example, the answer can't be both 50% and 25% but it can be both A and D) (attempt at a) solution: Spoiler *Let's suppose that A is the correct answer. Then D is the correct answer also, since they state the same thing. Therefore, the chance of hitting a correct answer is .5. Therefore, B is the correct answer which is contradictory. So A can't be the correct answer. *Under the same reasoning, D can't be the correct answer *Let's suppose B is the correct answer. Thus the chance of hitting a(the) correct answer is .25. Thus A or D is the correct answer, which is contradictory. *same goes with C Therefore none of the above answers is correct. That was fun! (or might still be if I got it wrong!) Are my assumptions wrong? Is the solution wrong?