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b = 3-1 = 2
n = 100: 2 = 50
gunakan rumus aritmatka
Sn = n/2(2a + (n-1)b)
= 50/2 ( 2x1 + ( 50-1)2)
= 25 ( 2 + (49)2)
= 25 ( 2 + 48)
= 25 (100)
= 2500
jawabnnya 2.500