Math, asked by princy4088, 1 year ago

The suitable formula to find the sum of first n terms of the AP 1 + 3 + 5 + 7 + ------ is ______
(a) 2 n² (b) n(n + 1 ) (c) n² (d) n(n-1)

Answers

Answered by HarshdeepSingh619
1

Sn = n/2(2a+(n-1)d)

Here a=1 and d=2

Sn= n/2(2×1+(n-1)2)

Sn=n/2(2+2n-2)

Sn=n/2×2n

Sn=n2

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