A box contains cards numbered 3,5,7,9...35,37.A card is drawn at random from the box . find the probability that the drawn card have either multiples of 7 or a prime number
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Total multiples of 7 = 3 ( 7, 21, 35 )
Total prime numbers = 11
Total probability = 19
Total out coming probability = 14
Probability = 14/19
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