SOLUTION: There are 15 appetizers available at a restaurant. From these, Barbara is to choose 12 for her party. How many groups of 12 appetizers are possible?

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Question 1038971: There are 15 appetizers available at a restaurant. From these, Barbara is to choose
12 for her party. How many groups of 12 appetizers are possible?

Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.
C%5B15%5D%5E12 = 15%21%2F%2812%21%2A3%21%29 = %2812%2A11%2A10%29%2F%281%2A2%2A3%29 = 2*11*10 = 220.

C%5Bn%5D%5Ek is the number of combination "n" things taken "k" at a time.

See the lesson Introduction to Combinations in this site, and associated lessons.