Determine the sum of the following series.

Determine the sum of the following series. Determine the sum of the following series. Sigm

Answer

sum = (1/5)/ (9/5) = 1/9

it is a GP

= -1/4 *sum of( (-4/5)^n)

apply the formula of infinite GP with common ratio = -4/5

= -1/4 * (-0.8/(1+0.8))

= 1/9 = 0.1111111

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