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3-82.

Determine whether each of the following sequences is arithmetic, geometric, or neither. Then find a rule for the sequence, if possible.

$12.2, 13, 13.8, …$
Hint (a):
See problem 3-46 for examples and hints.

$90, 81, 72.9, …$
Hint (b):
See part (a).

$1, 1, 1, …$
Hint (c):
This could be either arithmetic or geometric. Why?

$2, 4, 16, …$
Hint (d):
See part (a).

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