A box contains 20 balls bearing numbers 1,2 , \( 3, \ldots \ldots . .19,20 \) respectively. A ba...

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A box contains 20 balls bearing numbers 1,2 , \( 3, \ldots \ldots . .19,20 \) respectively. A ball is drawn at random form the box. Find the probability that the number - on the ball is -
(i) a prime number.
-(ii) an even number.
(iii) divisible by 3 or 5 .
(iv) neither divisible by 3 nor by 5 .
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