Question: I can't figure this out For the following arithmetic sequence, find the sum of the terms from an, to a17, inclusive 6, 9, 12, 15...
I can't figure this out

For the following arithmetic sequence, find the sum of the terms from an, to a17, inclusive 6, 9, 12, 15... The sum of the terms from a, , to a,7, inclusive, is (Type an integer or a decimal.)
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