Jawabanmu

2014-02-27T20:51:16+07:00
U1 = a = 1 U5 = ar^4 = 256 ar^4 = 256 1 x r^4 = 256 r^4 = 256 r^4 = 4^4 r = 4 U4 = ar^3 U4 = 1 x 4^3 U4 = 1 x 64 U4 = 64 jadi suku keempat adalah 64.