Q27 of 53 Page 15

A box contains 19 balls bearing numbers 1,2,3,…., 19. A ball is drawn at random from the box. Find the probability that the number on the ball is

(i) a prime number


(ii) divisible by 3 or 5


(iii) neither divisible by 5 nor by 10


(iv) an even number

(i) Possible Outcomes: 2,3,5,7,11,13,17,19


P(a prime number) =


(ii) Possible Outcomes: 3,5,6,9,12,15,10,18


P(divisible by 3 or 5) =


(iii) Possible Outcomes: 1,2,3,4,6,7,8,9,11,12,13,14,16,17,18,19


P(neither divisible by 5 nor by 10) =


(iv) Possible Outcomes: 2,4,6,8,10,12,14,16,18


P(an even number) =


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