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u6 = 972
972 = a. r^5
972 = 4 . r^5
972 : 4 = r^5
243 = r^5
3 = r
s6= a(r^n -1) per r-1
s6= 4 ( 3^6-1) per 3 -1
s6 = 4 ( 729-1) per 2
s6= 4 (728) per 2
s6= 2912 per 2
s6 =1456
*a = suku pertama
u = urutan
r = rasio
s = jumlah suku