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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
nC3+nC4
=n+1C4
=n+1Cn3
Now
n+1Cn3>n+1C3
Hence
n3>3
n>6.

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