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Question

If (pq) =0 for p<q p,qϵW then r=0 (n2r)

A
2n
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B
2n1
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C
22n1
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D
^2nCn
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Solution

The correct option is B 2n1
nC2r
Is the sum of even odd term in the binomial expansion of (1+x)n
Hence
nC2r will always be equal to 2n1.

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