Evaluate 11- 2 - 12- 3 - 13- 4- - -

11× 2 + 12× 3 + 13× 4+ .... =∑^∞_r=11r(r+1)=∑^∞_r=11r 1r+1 #160; =(1r 1r+1)+(1r+1 1r+2)+(1r+2 1r+3).......................=1r=1 ...

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Ratio and Proportion

Evaluate 11...

Question

Evaluate $\frac{1}{1 \times 2} + \frac{1}{2 \times 3} + \frac{1}{3 \times 4} + . . . .$ =

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Solution

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