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Questions  >>  CBSE XI  >>  Math  >>  Sequences and Series
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Find the sum of $n$ terms of an $A.P.$ whose $k^{th}$ term is $5k+1$

$\begin{array}{1 1} =\large\frac{n(5n+1)}{2} \\=\large\frac{n(5n+6)}{2} \\=\large\frac{n(5n-7)}{2} \\ =\large\frac{n(5n+7)}{2} \end{array} $

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