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3 June, 06:17

Which of the following is a geometric sequence?

a. 3, 7, 11, 15, 19

b. 4, 6, 10, 16, 26

c. 4, 16, 64, 256

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Answers (1)
  1. 3 June, 07:47
    0
    Hello,

    A: is an arithmetic sequence: f (n) = 3 + (n-1) * 4

    B: is a Fibbonacci's sequence f (n+2) = f (n+1) + f (n), f (1) = 4, f (2) = 6

    C: is a geometric sequence : first term = 4 ratio=4

    f (n) = 4*4^ (n-1) = 4^n
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