Farmer McDonald

Jessy314 · #1 Apr 22, 2007, 08:55 AM

Farmer McDonald has 6 pigs to feed, but room at the feeding trough for only 2 at a time. How many combinations of 2 pigs at the trough can be made from 6 pids?

bcarlstroem · Apr 22, 2007, 10:47 AM

Combination of 6 things taken two at a time (6C2) or 6!/4!2! = 15



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