Is "12, 15, 18, 21..." an arithmetic sequence?

1 Answer
VNVDVI
Apr 2, 2018

Yes.

Explanation:

A sequence is arithmetic if each term shares a common difference with the preceding term, d, IE, a_2-a_1=d, a_3-a_2=d,...,a_n-a_(n-1)=d

Here, 15-12=3, 18-15=3, 21-18=3, so the common difference is 3 and this is in fact an arithmetic sequence.

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