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Find the partial sum, `S_(7)`, for the geometric sequence with
`a = 6, r = 3`.
`S_(7)=`
`S_(7)=`
Get help:
Box 1: Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity
6558