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3 June, 12:34

What is the sum of an infinite geometric series if a1 = 5 and r = 1/3

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  1. 3 June, 14:10
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    7.5

    Step-by-step explanation:

    The first term is 5 and the ratio is 1/3

    The formula for the sum of an infinite geometric series is

    S = a1 / (1-r)

    S = 5 / (1 - 1/3)

    = 5 / (2/3)

    = 5 * 3/2

    = 15/2

    = 7.5
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