NEB Grade 12 Binomial theorem - C_1+2C_2+3C_3+..........+nCn = n2^(n-1)

NEB GRADE 12 BASIC MATH Binomial Theorem : If (1+x)^n=C_0+ C_1 x+C_2 x^2+ ………+C_n x^n,prove that
C_1+2C_2+3C_3+ ………+nC_n=n.2^(n-1)

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