Solve for S_11
S_{11} = \frac{35}{2} = 17\frac{1}{2} = 17.5
Assign S_11
S_{11}≔\frac{35}{2}
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S_{11}=\frac{3+32}{2}
Subtract 8 from 11 to get 3.
S_{11}=\frac{35}{2}
Add 3 and 32 to get 35.
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