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maka: S10 = a ( 1-r pangkat n) / 1-r
ini syarat r<1. r = -4/8. r = -1/2
S10 = 8 ( 1-(-1/2)pangakat 10 / 1-(-1/2)
S10 = 8 ( 1-1024) / 1+1/2
S10 = 8 (-1023) / 3/2
S10 = -8184/3/2
S10 = -8184x2/3
S10 = -5456 (hasil akhirnya itu minus).