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otomatis bilangan terkecil adalah 2
S3 = 3/2 (2a + (3 - 1)3)
15 = 3/2 (2a + 6)
10 = 2a + 6
4 = 2a
a = 2
U1 = a = 2
U2 = a + b = 2 + 3 = 5
U3 = a + 2b = 2 + 2(3) = 8
Bilangan yang terkecil adalah 2