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"Ingat Syarat Bar.Geometri"
Misalkan Bar.Geometri a,b,c,d,f,g
Logikanya : b²=aₓc bisa juga c²=bₓd bisa juga c²=aˣf (buktikan pake angka)
maka U₅=√3x12=6 maka r=2 dan a=3/8
U₈=ar⁷=3/8ˣ 2⁷=48
Un=arⁿ⁻¹=3/8ˣ2ⁿ⁻¹