6,18,54,162a = 6r = 3Un = a × r^(n-1)Un = 6 × 3^(n-1)^ = pangkat
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Un=6.3^(n-1)
Un=6.3^n/3
Un= 2.3^n
6,18,54,162
a = 6
r = 3
Un = a × r^(n-1)
Un = 6 × 3^(n-1)
^ = pangkat