Jawabanmu

2014-02-14T00:22:03+07:00
A = 2
b = U2 – U1
b = 4 – 2 = 2
Un = a + (n-1) b
U100=2 + (100-1) 2
        = 2 + 198 = 200
Sn = ½ n (a + Un)
S100 = ½ 100 (2 + 200)
         =50 x 202
         = 10100