SOLUTION: Rachel just received her transcript showing her grades in five academic classes. In how many ways could she have earned "A's" in at least three of her classes?

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Question 429194: Rachel just received her transcript showing her grades in five academic classes. In how many ways could she have earned "A's" in at least three of her classes?
Answer by jorel1380(3719) About Me  (Show Source):
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Since Rachel could have received in any three of her five classes, in no particular order, then the number of ways she could earn her A's is 5 combined 3 at a time, or 5!/3!2!, or 5X4X3X2X1/3X2X1X2X1, or 5X4/2 or 10.