Question

b)
A bag contains 6 red balls and some blue balls. If the probability of drawing a
blue ball is twice that of a red ball, find the total number of balls in the bag.
​

Answer 1

Answer:

No. of blue ball = 12

Step-by-step explanation:

Red balls = 6

Let blue ball= x

Total balls= 6+x

According to Condition 1st

P(E) of red balls = No.of Red balls/Total no. of balls

= 6/6+x

A/C 2nd

P(E) of blue ball= No. of blue ball/Total no. of balls.

2( 6/6+x) = x/ 6+x

12/6+x. = x/6+x

12. = x/6+x*6+x

12 = x

No. of blue balls= 12

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