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b = 2
Sn = n/2 (2a + (n - 1) b)
S15 = 15/2 (2 × 23 + (15 - 1) 2)
= 15/2 (74)
= 555 (A)
b = 2
Jumlah
= 15/2 (2 × 23 + (15 - 1) 2)
= 555 (A)