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Home  >>  JEEMAIN and AIPMT  >>  Mathematics  >>  Class11  >>  Sequence and Series
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If first and last term of an AP are $a$ & $l$ and sum of all terms is $s$, then common difference is


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Answer : (d) $\;\frac{l^2-a^2}{2s-(l+a)}$
Explanation : $s=\frac{n}{2}\;(a+l)$
answered Jan 21, 2014 by yamini.v

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