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Question

nr=1n1Cr1 =


A

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C

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Solution

The correct option is C


nr=1n1Cr1 = n1C0 + n1C1.............n1Cn1

It's the sum of the coefficients of the expansion (1+x)n1. We get the sum of the coefficients when

we put x = 1

nr=1 n1Cr1 = (1+1)n1

= 2n1


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