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if  nC3+nC4>n+1C3,then

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a
n>6
b
n>7
c
n<6
d
none of these

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detailed solution

Correct option is A

nC3+nC4>n+1C3⇒ n+1C4>n+1C3           ∵nCr+nCr+1=n+1Cr+1or  n+1C4 n+1C3>1or n−24>1or n>6


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