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U5 = 810
r= 3
U3 = a × r pngkat 3
90 = a × 3 pngkat 3
a = 90 / 9
a = 10
S6 = a (r pngkat n-1) / r -1
S6 = 10 ( 3 pngkat 5) / 5
S6 = 2430 / 5
S6= 486