Q. 715.0( 3 Votes )

12+ (12 + 22) + (12 + 22 + 32) + ……



Answer :


an = 12 + 22 + … + n2 = = =

Sn =

    =

    =

    = (n(n+1) + 2n + 1+ 1)

    = (n2+n+2n+1+1)

    = (n2+3n+2)

    = (n+1)(n+2)

    =

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