SOLUTION: how many ways can i choose 4 outfits to take on vacation if i have 10 outfits tofrom which to choose

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Question 1012888: how many ways can i choose 4 outfits to take on vacation if i have 10 outfits tofrom which to choose
Found 2 solutions by ikleyn, fractalier:
Answer by ikleyn(53763) About Me  (Show Source):
You can put this solution on YOUR website!
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how many ways can i choose 4 outfits to take on vacation if i have 10 outfits to from which to choose
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C%5B10%5D%5E4 = 10%21%2F%284%21%2A6%21%29 = 10%2A9%2A8%2A7%29%2F%281%2A2%2A3%2A4%29 = 210.

See the lesson Introduction to Combinations in this site.


Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
10 chosen 4 at a time is found by
10! / (10-4)!(4!) = 10*9*8*7/4*3*2*1 = 210 ways