Does the following series converge or diverge 7-21+63-189

asked Nov 9, 2018 210k views

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3 votes

it is converge because it is an infinite sequence

Roman Melnyk answered Nov 11, 2018

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The common ratio is:

-21/7=63/-21=-3

So r=-3

A series only converges if r^2<1, since r^2 in this case is 9, the series diverges.

Manish Sharma answered Nov 13, 2018