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Probabilities

by mariofelixpasku » Mon Oct 22, 2012 11:29 am
On an examination there are 25 different topics and only 3 questions. A student did not have enough time to prepare for 10 of the topics. What is the probability that he will be able to answer all three questions on the exam?

A: 91/120
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by vikram4689 » Mon Oct 22, 2012 6:16 pm
what is the source of this question. your answer seems incorrect.

student has prepared 15 topics and if all 3 question are from these 15 then she will be able to solve.

P=15/25 * 14/24 * 13/23 = 91/460
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