Q2 of 176 Page 20

Find the sum of the following geometric series :

1, - a, a2, - a3, …. to n terms (a ≠1)

Common Ratio =


∴ Sum of GP for n terms = …(1)


⇒ a = 1, r = - a, n = n


∴ Substituting the above values in (1) we get


⇒


⇒


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