Solve for S_7
S_{7}=27305
Assign S_7
S_{7}≔27305
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S_{7}=\frac{5\left(1-16384\right)}{1-4}
Calculate 4 to the power of 7 and get 16384.
S_{7}=\frac{5\left(-16383\right)}{1-4}
Subtract 16384 from 1 to get -16383.
S_{7}=\frac{-81915}{1-4}
Multiply 5 and -16383 to get -81915.
S_{7}=\frac{-81915}{-3}
Subtract 4 from 1 to get -3.
S_{7}=27305
Divide -81915 by -3 to get 27305.
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