Q29 of 53 Page 15

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

Total number of balls :- 18


Number of black balls:- 4


Number of white balls:- 6


Number of Red balls:- 8


(a) Since there are 14 balls which are red and white colour, so the total number of favourable cases becomes = 14


Total number of balls = 18


P(Red or white) =


(b) Not black balls mean that red or white is drawn.


Total number of balls = 18


P(Not black) =


(c) Neither white nor black means that the ball is drawn are red


Total Number of favourable cases = 8


P(Neither white Nor black) =


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(i) 8?


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(iii) a number greater than 2?


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A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears (i) a two-digit number (ii) a perfect square number (iii) a number divisible by 5.