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 either red or blue.

• A. 5/9
• B. 2/3
• C. 7/9
• D. 7/11

Answer 1

Answer:

C. 7/9

Total = 9 Red = 4 Blue = 3 Yellow = 2 P{Red} = 4/9 P{Blue}=3/9 = 1/3 P{either red or blue} = P{R} + P{B} = 4/9 + 3/9 = 7/9