Jawabanmu

2014-02-10T17:34:00+07:00
Beda = U2-U1= 8-2=6
U18=a+(n-1)b
=2+(18-1)x6
=2+17x6
=2+102=104
2014-02-10T17:52:16+07:00
U18=2+(18-1).6
        = 2+ 102=104