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berarti 102 + 105 + ... + 198 = ...
a = 102
b = 3
Un = a + (n - 1)b
198 = 102 + 3n - 3
198 = 99 + 3n
3n = 198 - 99
n = 99/3 = 33
S33 = 33/2(102 + 198)
= 33/2(300) = 4950