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a = 54
b = 6
a + (n-1)b = un
54 + (n-1)6 = 198
6n - 6 = 198 - 54
6n = 144 + 6
6n = 150
n = 25
s25 = 1/2n ( a + u25)
= 1/2*25 ( 54 + 198)
= 12,5 (252)
= 3.150
jadi jumlahnya 3.150