If C_0, C_1, C_2, , C_n are the coefficients in the expansion of (1+x)^n, then what is the value of C_1+C_2+C_3+ +C_n?

NDA 2021 Mathematics question

If are the coefficients in the expansion of , then what is the value of ?

Answer: (B)

. Putting gives . Since , we get . Option (a) is

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Question ID VK-033495