Jawabanmu

2014-04-20T16:57:07+07:00
A U₁ = 102, Un = 198, b = 3
n = Un - U₁ / b + 1
= 198 -102 / 3 + 1
= 33

Sn = n/2 (U₁ + Un)
= 33/2 (102 + 198)
= 33/2 (300)
= 33 * 150
= 4.950