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u4 = a. r^ 3 = 54
dibagi keduanya menjadi
r^3 = 27
r = 3
subtitusikan
a. 3^3 = 54
a. 81 = 54
a = 54 : 81
a = 2 per 3
u4 = 54 , u5 = 162, u6= 486, u7= 1458
jumlah u5 samapai U7 adalh = 54 +162 + 486+ 1458
= 2.160