I need help with a data management question please help!

Posted on 2014-04-04 08:13:00 in Management by JASMINE

If you do not know the correct way in solving and you are just guessing, I appreciate it but please don't answer. The question is:



Erica has mastered the proofs for ix of ten theorems. Two of the theorems will appear as questions on the final examination. What is the probability that..

1a) Neither of the proofs on the examination will be emong those that Erica mastered?

b) At least one of the mastered proofs of the mastered proofs will appear on the examination?



The answer to 1a is 2/15 and the answer to 1b is 13/15..

I just need to know how to get that answer. I think it somehow involves permutations or combinations

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