Solve for S_21
S_{21}=1134
Assign S_21
S_{21}≔1134
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S_{21}=\frac{84\times 27}{2}
Add 2 and 82 to get 84.
S_{21}=\frac{2268}{2}
Multiply 84 and 27 to get 2268.
S_{21}=1134
Divide 2268 by 2 to get 1134.
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