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If a digit is chosen at random from the digits $1, 2, 3, 4, 5, 6, 7, 8, 9$; then the probability that this digit is an odd prime number is :
- (a)$\frac{1}{3}$
- (b)$\frac{4}{9}$
- (c)$\frac{2}{3}$
- (d)$\frac{5}{9}$
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(A) $\frac{1}{3}$