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This is the formula for the nth term in an arithmetic sequence:
d is the common difference and n is the number of terms.

This is the formula since an arithmetic sequence looks like this:

a_6=a_1+(6-1)10 \\ 62=a_1+50 \\ 12=a_1

Since we have the first term equal to 12 then:
a_{15}=a_1+(15-1)10 \\ a_{15}=12+140=152

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