3 years ago

A club has 12 members. In how many ways can we select four members to go on a trip?

1 answer:

3 0

This is the number of combinations of 4 from 12

12C4 = 12!
----------
4! 8!

= 12*11*10*9 11*5*9 = 495
-------------- =
4*3*2*1

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