Greetings from Brasil....
Every rational number is written as:
A/B where A ∈ ℤ and B ∈ ℤ* (B ≠ 0)
So in our case, 2/9 is a rational number, because we have the division of 2 by 9 and 2 ∈ ℤ and 9 ∈ ℤ*
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