Answers

  • Brainly User
2016-06-25T21:56:56+08:00
NO, it's not an arithmetic sequence, because there is no common difference.

It's a geometric sequence.  To find the rule for 4, 16, 64, 256:

General formula:   an = a₁ (r)^{n-1}

Find the common ratio:
16/4 = 4
64/16 = 4
256/64 = 4

a₁ = 4     d = 4

an = 4(4) ^{n-1)}


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