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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
maaf kalo salah