Jawabanmu

2014-07-18T14:34:27+07:00
A = 100      b = -2
   u_{n} = a + (n -1).b
 0 = 100 + (n - 1).(-2)
2n = 100 + 2
n= 51

salah perhitugan sepertinya, 2n=102. n=51
sorry ya
ok