Solve for a_15
a_{15}=88
Assign a_15
a_{15}≔88
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a_{15}=4+14\times 6
Subtract 1 from 15 to get 14.
a_{15}=4+84
Multiply 14 and 6 to get 84.
a_{15}=88
Add 4 and 84 to get 88.
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