JEE MATHEMATICS MCQ: SEQUENCE OF SERIES

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\sum\limits_{{j=1}}^{n} \sum\limits_{{i=1}}^{n} i

is equal to

View answer and explanation

Correct option: C

\frac{n^{2}(n+1)}{2}

Option C (

\frac{{n^{{2}}(n+1)}}{{2}}

) is correct because the inner sum is

\frac{{n(n+1)}}{{2}}

, and the outer sum multiplies this by n.

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