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Which of the following is a rational number?

A$\sqrt{2}$
B$\sqrt{3} + 1$
C$\pi$
D$\frac{7}{9}$
Answer & Solution
Correct answer: D. $\frac{7}{9}$
A rational number can be written as p/q with integers p, q and q ≠ 0. 7/9 fits. √2, π are non-terminating non-repeating irrationals √3 + 1 is rational + irrational = irrational.
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