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A student read common difference of an A. P. as
-2 instead of 2 and got the sum of first 5 terms as -5 . Actual sum of first five terms is
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-2 instead of 2 and got the sum of first 5 terms as -5 . Actual sum of first five terms is
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Verified Answer
The correct answer is:
35
$\frac{5}{2}\{2 \mathrm{a}+4(-2)\}=-5 \Rightarrow 2 \mathrm{a}=6$
$\therefore$ Actual sum $=\frac{5}{2}\{6+4(2)\}=35$
$\therefore$ Actual sum $=\frac{5}{2}\{6+4(2)\}=35$
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