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U12 = a11 + b = 49
⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻ ⁻
-5 = -20
a = 4
U7 = a6 + b = 29
U7 = 4 × 6 + b = 29
b = 5
Un = a(n-1)b
U9 = 4(9-1)5
U9 = 4+8×5
U9 = 44
Suku ke-7 = 29
Suku ke-12 = 49
Ditanya: Suku ke-9 ?
Penyelesaian
(49-29) : (12-7) = 20 : 5 = 4 (selisih)
Jadi, suku ke :
(7) 29
(8) 33
(9) 37
(10) 41
(11) 45
(12) 49
Jawab : Suku ke-9 = 37