Jawabanmu

2014-04-25T06:49:44+07:00
 r = u2/u1 = 1/4 
a = u1 = 4

lalu Sn utk r < 1 adalah :
Sn = a(1-r^n) : (1-r^n)
S10 = 4(1-(1/4)^10) : (1-(1/4)^10)
S10 = 3,999996185 : 0,999999046
S10 = 4
:)
2014-04-25T07:16:30+07:00
 r = u2/u1 = 1/4 
a = u1 = 4

lalu Sn utk r < 1 adalah :
Sn = a(1-r^n) : (1-r^n)
S10 = 4(1-(1/4)^10) : (1-(1/4)^10)
S10 = 3,999996185 : 0,999999046
S10 = 4