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b = 24-21
= 3
jumlah 20 suku pertama
Sn = n/2 ( 2a + (n-1)b)
= 20/2 ( 2 x 21 + ( 20-1) 3)
= 10 ( 42 + 57)
= 10 (99)
= 990
jawabnya 990