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a = 10
r = 3
maka r >1
sehingga :
J6 = a(r^6 - 1)/ r-1
= 10(3^6 -1)/ 3-1
= 10(729 - 1) / 2 = 7280/2 = 3.640
J10 = a(r^10 - 1)/r-1
= 10(3^10 - 1) / 3-1
= 10(59049 - 1) / 2
= 590.480/2 = 295.240