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Cards bearing numbers $3$ to $20$ are placed in a bag and mixed thoroughly. A card is taken out of the bag at random. What is the probability that the number on the card taken out is an even number ?
- (a)$\frac{9}{17}$
- (b)$\frac{1}{2}$
- (c)$\frac{5}{9}$
- (d)$\frac{7}{18}$
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(B) $\frac{1}{2}$