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U5 = 192
U5 = a.r^4 = 192
U1 = a = 12 :
r^4 = 16
r = 2
Saya lupa rumus Sn nya .. :v . Itung satu satu aja ya ..
U1 = 12
U2 = 12 * 2 = 24
U3 = 24 * 2 = 48
U4 = 48 * 2 = 96
U5 = 96 * 2 = 192 +
S5 = 372