Jawabanmu

2014-04-07T21:15:07+07:00
2014-04-07T21:26:46+07:00
2,4,8,16... a=2 r=2 Un=a.r^(n-1) = 2.2^(n-1) = 2.2^n.1/2 = 2^n Un= 2^n
7 4 7