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  4. If Cr = nCr, then the value of 2((C1/C0)+2(C2/C1)+3 (C3/C2)+....n(Cn/Cn-1))

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Q. If $ C_r =\,{}^ nC_r$, then the value of $2\left(\frac{C_1}{C_0}+2\frac{C_2}{C_1}+3 \frac{C_3}{C_2}+....n\frac{C_n}{C_{n-1}}\right)$

Binomial Theorem

Solution:

Correct answer is (b) n(n + 1)