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Find 2 xx 6 + 4 xx 9 + 6 xx 12 + …… upto...

Find `2 xx 6 + 4 xx 9 + 6 xx 12 +` …… upto n terms.

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The correct Answer is:
`6 [ (n (n +1) ( 2n + 1))/( 6) + (n (n +1))/( 2) ]`
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