Question

Which function describes the sequence 4, 12, 36, 108, ... for n = 1, 2, 3, 4...?

a) f(n) = 2" + 1

b) f(n) = 3n

c f(n) = (n − 1)2 + 3

d) f(n) = 4.3"-1

Answer 1

d) f(n) = 4 . 3^(n-1)

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