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U1 = a = 1
U2 = 8
maka
rasio = r = U2/U1 =8/2 = 4
atau
r = U3/U2 = 32/8 = 4
atau
r = U4/U3 = 128/32 = 4
Jadi,
Un = a.r^n-1
U10 = a.r^10-1
= a.r^9
= 2.4^9
= 2 . 262144
= 524288
Un = a.r^n-1
Un = 2.4^n-1