A box contain 20 balls bearing numbers 1,2,3,4...20 . A ball is drawn from the box . what is the probability that the number on the ball is . (¡) an odd number (¡¡) divisible by 3 (¡¡¡) prime number .
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1- 10/20=1/2
6/20=3/10
3-8/20=2/5
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