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Submitted by humraj on Fri, 2007-10-19 18:48

There are 6 letters and 6 addressed envelops. If one letter is assigned to one envelope randomly, then in how many ways can exactly 4 letters go into the wrong envelope?

‹ permutations QBM073 ›

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Posted on: Sat, 2007-10-20 00:28 #1
@ Humraj

is it

6C2 [4! - 1] = 345

__________________

n/a

Posted on: Sat, 2007-10-20 00:58 #2
i thnk the ans is 135

i thnk the ans is 135 ??????????

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