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28 May, 20:56

Which of the following is the explicit formula for the geometric sequence 320, 80, 20, 5, ... ?

G (n) = 320 (¼) n-1

G (n) = 320 (4) n-1

G (n) = 320 (¼) n

G (n) = ¼ (320) n-1

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  1. 28 May, 21:17
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    Common ratio can be found by dividing the second term by the first term

    80/320 = 0.25 (which is 1/4)

    G (n) = a1 * r^ (n-1)

    a1 = first term = 320

    r = common ratio = 1/4

    so ur formula is : G (n) = 320 (1/4) ^n-1
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