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Verified answer
A/b - b/a = (a + b) / ab(a² - b²) / ab = (a + b) / ab
a² - b² = a + b
(a + b)(a - b) = a + b
a - b = 1
a = 1 + b
1 ≤ a,b ≤ 9
b = 1 , a = 2
b = 2 , a = 3
b = 3 , a = 4
....
b = 8 , a = 9
Banyaknya = 8
(B)
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