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[Post New]12 Mar 2008 16:23:22 IST
    Subject: Re:Permutations:In how many ways can 4 ppl be selected out of 10 ppl,such none is selected co
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priyesh (1586)

Blazing goIITian

Olaaa!! Perrrfect answer. 256  [409 rates]
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ans is 7C4
 
bcoz let the 6 persons not selected be seated
so the four selected persons can be seated in between the seven gaps 
so no. of ways of selecting four gaps out of 7 = 7C4 = 35
"Imagination is more important than knowledge."
 this reply: 10 points  (with 2 Olaaa!! Perrrfect answer.   in 2 votes )   [?]
 
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