(1/1.4)+(1/4.7)+(1/7.10)+ ldots to n terms =

Question

(1/1.4)+(1/4.7)+(1/7.10)+ ldots to n terms = (A) (1/5 n-1) (B) (1/3 n-1) (C) (n/3 n+1) (D) (n/5 n-1)

Tardigrade Admin · Accepted Answer

Correct answer is (c) (n/3 n+1)

Q. $\frac{1}{1.4} + \frac{1}{4.7} + \frac{1}{7.10} + \dots$ to $n$ terms $=$