Jawabanmu

2014-03-21T20:50:35+07:00
U100 = a +(n-1)b = -6 + (99x2) = -6 + 198 = 192
2014-03-21T20:53:13+07:00
Un=a(n+1)b
U100= -6*(100+1)-2
U100= -606*-2
U100=1212