jumblah suku kelipatan 3 antara 100 dan 200 adalah

102 - 198
b = 3
198 = 102 + (n-1)3
198 = 102 + 3n - 3
198 + 3 - 102 = 3n
99 = 3n
n = 33

S33 = 33/2 (102+198)
S33 = 33/2 (300)
= 33 x 150
= 4950

103,106,109,112,115,118,121,124,127,130,133,136,139,142,145,148,151,154,157,160,163,166,169,172,175,178,181,184,187,190,193,196,199,

                 maaf kalo salah