Q. 7

# Find the sum of t

The nth term will be n2×(2n + 1)

The generalized equation be

We know by property that:

∑axn + bxn - 1 + cxn - 2…….d0=a∑xn + b∑xn - 1 + c∑xn - 2…….. + d0∑1

Thus

………(1)

We know

Substituting the values in (1)

=

=

=

=

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