# Find 15th term of the arithmetic sequence 17, 24, 31, …

Find 15th term of the arithmetic sequence 17, 24, 31, …
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This is an arithmetic sequence, so it must have a common difference:
$d=24-17=7$
Now to write formula to find the fifteenth term:
${a}_{15}={a}_{1}+7\left(15-1\right)$
${a}_{15}=17+98=115$