SOLUTION: A professor grades homework by randomly checking 9 of the 25 problems assigned. In how many different ways can this be done?

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Question 1008170: A professor grades homework by randomly checking 9 of the 25 problems assigned. In how many different ways can this be done?
Answer by jorel555(1290) About Me  (Show Source):
You can put this solution on YOUR website!
25 choose 9=25!/16!9!=2042975 different ways to check assignments!!!!!!!!!!!!!!