SOLUTION: A professor grades homeowrk by randomly checking 7 of the 20 problems assigned. in how many different ways can this be done?

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Question 115154: A professor grades homeowrk by randomly checking 7 of the 20 problems assigned. in how many different ways can this be done?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
20*19*18*17*16*15*14=390,700,800 ways to select 7 out of 20 problems.