Q28 of 53 Page 15

A bag contains 4 white ball, 6 red balls, 7 black balls and 3 blue balls. One ball is drawn at random from the bag. Find the probability that the ball drawn is

(i) white


(ii) not black


(iii) neither white nor black

Total number of balls = 20


(i) Number of White Balls = 4


Total Balls = 20


P(white) =


(ii) No black means the we have to pick white, red, blue balls only


P(not black) =


(iii) neither black nor white means only white and red balls are left


P(neither white nor black) =


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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


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A bag contains 8 red,6 white and 4 black balls. A ball is drawn at random from the bag. Find the probability that the ball is drawn is :

(a) Red or white


(b) Not black


(c) Neither white Nor black

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A game of chance consists of spinning an arrow which comes to rest pointing at one of the numbers 1,2,3,4,5,6,7,8, and these are equally likely outcomes. What is the probability that it will point at

(i) 8?


(ii) an odd number?


(iii) a number greater than 2?


(iv) a number less than 9?