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bilangannya : 102, 104.106 .... 148
a = 102
b= 104-102= 2
un = a+(n-1)b
148= 102+(n-1)2
148-102 = 2n - 2
46+2 = 2n
n = 48/2 = 24
Sn = n/2 (a+un)
S24 = 24/2 ( 102 + 148)
= 12 (250)
= 3.000