Let `(1 + x)^(n) = sum_(r=0)^(n) C_(r) x^(r)` and , `(C_(1))/(C_(0)) + 2 (C_(2))/(C_(1)) + (C_(3))/(C_(2)) +…+ n (C_(n))/(C_(n

Let `(1 + x)^(n) = sum_(r=0)^(n) C_(r) x^(r)` and ,
`(C_(1))/(C_(0)) + 2 (C_(2))/(C_(1)) + (C_(3))/(C_(2)) +…+ n (C_(n))/(C_(n-1)) = (1)/(k) n(n+1)`,
then the value of k, is
A. `1//2`
B. 2
C. `1//3`
D. 3

Let `(1 + x)^(n) = sum_(r=0)^(n) C_(r) x^(r)` and , `(C_(1))/(C_(0)) + 2 (C_(2))/(C_(1)) + (C_(3))/(C_(2)) +…+ n (C_(n))/(C_(n-1)) = (1)/(k) n(n+1)`,

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