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Question

If nC3+nC4>n+1C3,then,

A

n > 6

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B

n > 7

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C

n < 6

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D

None of these

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Solution

The correct option is A

n > 6


nCr+nCr1=n+1Cr
nC3+nC4>n+1C3
n+1C4>n+1C3
nCrnCr1=nr+1r
n+1C4n+1C3>1n24>1 n >6.

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