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Cards numbered $10, 11, 12, \dots, 30$ are kept in a box and shuffled thoroughly. Rohit draws a card at random from the box. The probability that the number on the card is a multiple of $4$ or $5$ is :
- (a)$\frac{9}{20}$
- (b)$\frac{9}{21}$
- (c)$\frac{10}{20}$
- (d)$\frac{10}{21}$
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(B) $\frac{9}{21}$