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Suku ke-2 = a + (2-1) × b = 6
Suku ke-4 = a + 3b = 24
Suku ke-2 = a + 1b = 6
___________________ -
2b = 18
b = 18 : 2 = 9
Masukkan ke rumus suku ke-2 = a + (n-1) x b
= a + 1 x 9 = 6
= a + 9 = 6
= a = 6 - 9
= a = -3
Suku ke-10 = a + (n-1) x b
= -3 + 9 x 9
= -3 + 81 = 78