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b = 14-7
= 7
s20 adalah ?
S20 = n/2 (2a + (n-1)b)
= 20/2 ( 2 x 7 + (20-1) 7)
= 10 ( 14 + (19) 7)
= 10 ( 14 + 133)
= 10 (147)
= 1470