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Which formula describes the following geometric sequence? Remember that n represents the term number. 3, 6, 12, 24, ... an = 2 · 3n - 1 an = 3 · 2n - 1 an = 2 + 3(n - 1) an = 3 + 2(n - 1)

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meerkat18
geometric sequence:
1st 2nd 3rd 4th
  3,   6,   12,  24,... 

an = 2 * 3n - 1
an = 3 * 2n - 1
an = 2 + 3(n-1) 
an = 3 + 2(n-1)

n = term number

first term = 3 ; common ratio is 2

a(n) = 3 * 2(n-1)
a(3) = 3 * 2(3-1)
a(3) = 3 * 2(2)
a(3) = 3 * 4
a(3) = 12  correct.

a(n) = 3 * 2(n-1)

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