Question

Find the nth term and then the sum of the first term of each of the following series. 1.1 + 2.2 + 3.3 + 4.4 +..
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Answer 1

Answer:

1.1 + 2.2 + 3.3 ... n.n

therefore nth term is n²

sum of the series with n terms= n(n+1)(2n+1)/6