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23 October, 08:17

the first term in a geometric series is 64 and the common ratio is 0.75. Find the sum of the first 4 terms in a series.

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  1. 23 October, 08:41
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    hi

    u0 = 64 with u (n+1) = un * 0.75

    u3 = 64 * 0.75^3 = 27

    sum is : 64 * (0.75^4 - 1) / 0.75-1 = 175

    manual proof : 64 + 48+36+27 = 175
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