Question10&11

Question10&11 orthe products of the tennurnborså A, S 55 (d)gs

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10

= - (\frac{n (n + 1) (2 n + 1)}{6}) Here n = 5 = - (\frac{5 (5 + 1) (2 (5) + 1)}{6}) = - (\frac{5 \times 6 \times 11}{6}) = - 55 Note : \sum_{}^{} n^{2} = 1^{2} + 2^{2} + . . . + n^{2} = \frac{n (n + 1) (2 n + 1)}{6}

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