Find the sum of first 51st terms of an AP whose 26th term is 18 – InterviewSolution

1.

Find the sum of first 51st terms of an AP whose 26th term is 18

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$\bf given\: a_{26}=18$

$\bf a+25d=18$

$\bf \underline {a=18-25d}$

$\Huge\bf {\boxed {\underline{ S_n=n/2(2a+(n-1)d }}}}$

$\bf S_{51}=51/2(2(18-25d)+50d)$

$\bf \boxed{\underline {S_{51}=918 }}$

HOPE the answer HELPS

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