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Find the sum first 'n' terms of the se...

Find the sum first 'n' terms of the series` (3+7+13+21+31+..)` ?

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Find the sum of the first n terms of the series: 3+7+13 +21 +31 +...

Find the sum of the first n terms of the series: 3+ 7 +13 +21 +31 +........

Find the sum of the first n terms of the series: 3+ 7 +13 +21 +31 +........

Find the sum of the first n terms of the series: 3+ 7 +13 +21 +31 +........

Find the sum of the first n terms of the series: 3+7+13+21+31+...

Find the sum of the first n terms of the series : 3 + 7 + 13 +21 + 31 +.....

Find the sum of the first n terms of the series : 3 + 7 + 13 +21 + 31 +dot dot dot