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Rasio = U2 : U1 = 4:2 = 2
Un = ar(pangkat n-1) = 2.2(pangkat n-1) = 2 (pangkat n)
U7 = 2(pangkat 7) = 128
a. U1 = 2 (U1 = suku pertama)
b. rasio =
=
= 2
c. Un = a .
= 2 .
=
d. U7 =
= 128