Jawabanmu

2014-01-24T15:03:44+07:00
U1 = 1-9 (dimisalkan = 1)
U2 = 10 - 99 (dimisalkan = 10)
U3 = 100 - 999 (dimisalkan = 100)

Barisan geometri = r = U2/ U1 = 10
U10.000 = a(r^n - 1) / (r - 1) = (1 * (10^10000 - 1)) / ( 10 - 1) =  99999 / 9 = 11111