Question

A bag contains 9 discs of which 4 are red. 3 are blue and 2 are yellow. The discs are similar in shape and size. A disc is drawn at random from the bag.Calculate the probability that it will be (i) red. (ii) yellow, (iii) blue, (iv) not blue,(v) either red or yellow. Select the correct answer from above options

Answer 1

probability of getting any 1 disk = 1 9 (i) p(red)=4⋅ 1 9 = 4 9 (ii) p(yellow)=2⋅ 1 9 = 2 9 (iii) p(blue)=3⋅ 1 9 = 3 9 = 1 3 (iv) p(not blue)=1-p(blue) =1- 1 3 = 2 3 (v) p(red or yellow) = p(red)+ p(yellow) = 4 9 + 2 9 = 2 3 answer