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The numberof ways in which 2n distinct l...

The numberof ways in which 2n distinct letters (addressed) can be distributed in N distinct mail boxes such that there are exactly K letters `(n lt K le 2n)` in one of the mail boxes is

A

`""^(2n)C_(K)`

B

`""^(2n)C_(K).N(N-1)^(2n-K)`

C

`""^(2n)C_(K).(N-1)^(2n-K)`

D

`""^(2n)C_(K)(2n-K)^(N-1.N`

Text Solution

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The correct Answer is:
B
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