The sequences below are either arithmetic or geometric. For each sequence, determine whether i it is arithmetic or geometric, and write the formula for the nth term an of that sequence

TYPE nth term formula

16, 19, 22, ...

7, 21, 63, ...

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So the sequence has a common difference of 3 and hence is an arithmetic sequence.

The nth term of the sequence is

So the sequence has a common ratio of 3 and hence is a geometric sequence.

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