Question

25. (a) A bag contains 5 red balls and some blue balls. If the probability of drawing a blue
ball is double that of a red ball, determine the number of blue balls in the bag.​

Answer 1

hey mate!

p (E) = no of favourable outcomes / total no of outcomes

given: probability of blue balls = 2 × probability of red balls

now red balls = 5

double of red balls =10= blue balls

=> total no of balls = 5+15 = 20

therefore, probability of blue balls = 10/20 = 1/2

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