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  4. (1/1.4)+(1/4.7)+(1/7.10)+ ldots to n terms =

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

Principle of Mathematical Induction

Solution:

Correct answer is (c) $\frac{n}{3 n+1}$