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Home  >>  JEEMAIN and AIPMT  >>  Mathematics  >>  Class11  >>  Sequence and Series
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Given an AP, if the sum of first 5 terms is 175 and the sum of first 10 terms is 700, find the sum of the first 7 terms.

$\begin{array}{1 1} 14 \\ 7 \\ 343 \\ 49 \end{array}$

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Answer : (c) 343
$Explanation :\;S_{n}=\frac{n}{2}\;[2a+(n-1)d ]$
answered Jan 6, 2014 by yamini.v

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