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3
9 = 3x3 =3x3^1
27 = 3x9 =3x3^2
81 = 3x27 =3x3^3
Un = 3x3^(n-1)
Un = 3^n
b. 32,16,8,4,...
32
16 = 32/2 = 32x(1/2)
8 = 32/4 = 32x(1/2)^2
4 = 32/8 = 32x(1/2)^3
Un = 32 x (1/2)^(n-1)
Un = 64 x (1/2)^n
nb: ^ artinya pangkat