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The sum of an infinite geometric series is 5/9 and the common ratio is -4/5. How to find the first term.?

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The sum of an infinite geometric series is 5/9 and the common ratio is -4/5. How to find the first term.?

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  1. S∞ = a / (1 - r)

    5/9 = a / (1 - -4/5)

    5/9 = a / (9/5)

    5/9 * 9/5 = a

    a = 1

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