math
posted by kaykay .
how many different ways can you pick 2 objects from a set of 7 objects?

The number of ways to pick m objects from n is
C(n,m) = n!/(m!(nm)!)
So 2 objects from 7 there are C(n,m) [n choose m] ways.
C(n,m)=7!/(5!(75)!)=28
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