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7 November, 08:22

What is the sum of the first five terms of the geometric sequence in which a1 = 10 and r=1/2

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  1. 7 November, 08:34
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    Answer:19.375

    Step-by-step explanation:

    a=10

    r=1/2=0.5

    Sn=a (1-r^n) / (1-r)

    S5=10 (1 - (0.5) ^5) / (1-0.5)

    S5=10 (1-0.03125) / (0.5)

    S5 = (10 x 0.96875) / (0.5)

    S5=9.6875 ➗ 0.5

    S5=19.375
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