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A number is chosen from the numbers $1, 2, 3$ and denoted as $x$, and a number is chosen from the numbers $1, 4, 9$ and denoted as $y$. Then $P(xy < 9)$ is:
- (a)$\frac{1}{9}$
- (b)$\frac{5}{9}$
- (c)$\frac{3}{9}$
- (d)$\frac{7}{9}$
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(c) $\frac{5}{9}$