
Jon S. answered 07/20/21
Patient and Knowledgeable Math and English Tutor
Since order is not important you want to compute the number of combinations of 9 items out of 12
12! 12 * 11 * 10 220
----- = --------------- =
9! 3! 3 * 2 * 1
Nikki J.
asked 07/20/21
Kate has 12 different types of flowers but she wants to make a floral arrangement with only 9 of them. How many possible flower arrangements are there?
Jon S. answered 07/20/21
Patient and Knowledgeable Math and English Tutor
Since order is not important you want to compute the number of combinations of 9 items out of 12
12! 12 * 11 * 10 220
----- = --------------- =
9! 3! 3 * 2 * 1
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