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4,8,12,...148 n = 37
Sn = n/2 ( a + un)
s37 = 37/2 ( 4 + 148)
= 18,5(152)
= 2.812
habis bagi 7 dan 4 = 28
28,56....140,,,,n = 5
S5 = 5/2 ( 28 + 140)
= 2,5 (168)
=420
hasilnya 2.812 - 420 = 2.392