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Un = a.r^n-1
Maka
U6 = 32 = a.r^5 .......(1)
U9 = 256 = a.r^8.......(2)
Pers (2) / Per (1)
256/32 = a.r^8/a.r^5
8 = r^3
r = 2
maka suku pertama nya adalah
32 = a.r^5
32 = a.(2)^5
32 = a.32
a = 1
Suku ketiga nya adalah
U3 = a.r^2
U3 = 1.(2)^2
U3 = 4