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Cards numbered 10, 11, 12, ..., 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)$\frac{10}{20}$
- (c)$\frac{9}{21}$
- (d)$\frac{10}{21}$
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(B) $\frac{9}{21}$