Sum the series: 1+3+7+15+31+............to n terms.

Let sn = 1 + 3 + 7 + 15 + 31 + 63

nth term, tn = 2n – 1

= (21 + 22 + 23 + ......... + 2n) – (1 + 2 +  ........ n)

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