Find the sum to n terms in the geometric progression 1, - a, a^2, - a^3,....(if a ≠ -1)

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asked Feb 10, 2018 in Mathematics by Rohit Singh (61,782 points) 35 133 354

Find the sum to n terms in the geometric progression 1, - a, a2, - a3,....(if a ≠ -1)

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answered Feb 10, 2018 by sameer (82,980 points) 5 11 37

The given G.P. is 1, -a, a2, - a3,..............
Here, first term = a1 = 1 

Common ratio = r = – a

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