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Question

Find the sum of the following:
(11n)+(12n)+(13n)+.... upto n terms.

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Solution

S=(11n)+(12n)+(13n)+ upto 'n' terms
=(1+1+n+times)1n(1+2+3+n term)
=n1n×n(n+1)2
=nn+12
=2nn12=n12

1073225_1183602_ans_986ec8c4e0fd4975b81fc7ab997caf7a.png

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