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Q)

Find sum of first n terms of series : $\;1+\large\frac{1}{1+2}+\large\frac{1}{1+2+3}+\;....$

$(a)\;\large\frac{n}{n-1}\qquad(b)\;\large\frac{2n}{n+1}\qquad(c)\;\large\frac{2n}{n-1}\qquad(d)\;\large\frac{n}{n+1}$

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