SOLUTION: I am really having trouble trying to get this. My head is spinning in circles: how many 'combinations' of 3 persons can you obtain from a group of 6 persons

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Question 413236: I am really having trouble trying to get this. My head is spinning in circles:
how many 'combinations' of 3 persons can you obtain from a group of 6 persons
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

no. of ways to find combination of r from n = nCr = n!/[r!*(n-r)!]

no. of ways to find combination of 3 from 6 = 6C3 = 6!/[3!*3!] = 20