If (1+x)^n=C_0+C_1x+C_2x^2+ +C_nx^n, then the value of C_0+2C_1+3C_2+ +(n+1)C_n will be

JEE Main Mathematics question

If , then the value of will be

Answer: (A)

Split the sum as . and $

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Question ID VK-021081