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U4 = ar^3 = 24
U7 = ar^6 = 192
⇒ Eliminasi
ar^6 = 192
ar^3 = 24 :
r^3 = 8
r = ∛8
r = 2
⇒ Cari nilai a = U1
ar^3 = 24
a(2)^3 = 24
8a = 24
a = 24/8
a = 3
⇒ Maka nilai dari U12
jadiin yang terbaik ya :3