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6-3
486-18
3
468
3
156
jawabannya 6
u6 = ar^5 = 486
u6/u3 = ar^5/ar^2 = r^3
r^3 = 486/ 18 = 27
r = 3
ar^2 = 18
a , 3^2 = 18
a . 9 = 18
a = 18/9 = 2....A