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Home  >>  JEEMAIN and AIPMT  >>  Mathematics  >>  Class11  >>  Sequence and Series
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Find sum of first n terms of series : $\;1+\large\frac{1}{1+2}+\large\frac{1}{1+2+3}+\;....$


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Answer : (b) $\;\large\frac{2n}{n+1}$
Explanation : $a_{r}=\large\frac{1}{\large\frac{r(r+1)}{2}}$
answered Jan 23, 2014 by yamini.v 1 flag

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