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15 August, 12:06

Three terms of an arithmetic sequence are shown below. Which recursive formula defines the sequence?: f (1) = 6, f (4) = 12, f (7) = 18

a. f (n + 1) = f (n) + 6

b. f (n + 1) = 2f (n)

c. f (n + 1) = f (n) + 2

d. f (n + 1) = 1.5f (n)

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  1. 15 August, 12:08
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    A = 6

    tn = a + (n - 1) d

    t4 = 6 + 3d = 12

    3d = 12 - 6 = 6

    d = 6/3 = 2

    f (n + 1) = f (n) + 2
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