A club has 6 members.From these members, the positions of president and vice -president have to be filled. .In how many different ways can these 2 positions be filled ?
6C2 = 6!/2!(6-2)! = 720/2(4)! = 720/2(24) = 720/48 = 15
So in 15 ways the positions of president and vice -president will be filled.
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