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12 August, 09:41

Find an explicit formula for the geometric sequence 3,15,75,375

a (n) =

+3
Answers (1)
  1. 12 August, 10:35
    0
    an = 3 (5) ^ (n-1).

    Step-by-step explanation:

    15 / 3 = 5

    75/15 = 5

    375/75 = 5

    So the common ratio is 5.

    First term a1 = 3

    an = a1 r^ (n-1) is the explicit formula.

    so here we have:

    an = 3 (5) ^ (n-1).
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