Question

Q34.
Probability of getting a blue ball is2by3 , from a bag containing 6 blue and 3 red balls. 12 red balls are being added in the bag,
then find the probability of getting a blue ball.
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Answer 1

Given, number of blue balls in bag = 6

number of red balls in bag = 3

Total balls in a bag = 6+3 = 9

After adding 12 red balls,

Total number of balls = 9 +12 = 21

Number of red balls = 3+12 = 15

p(getting blue balls) = $\frac{no. of blue balls }{total no. of balls}$

                                 =$\frac{6}{21}$

                                 = $\frac{2}{7}$

Answer 2

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