Question

A bag contains 30 balls out of which x balls are blue. If 10 blue balls are removed from the bag, the probability of drawing a blue ball is half of the initial probability. The value of x is

Answer 1

Answer: p(E2)

Step-by-step explanation: Answer:

➡️Initially there are 5 blue balls

➡️after adding 7 more balls at last bag have5+7= 12 blue balls.

Solution:

Total balls in bag = 35

Blue balls are = x

Probability of getting a blue ball p(E1) = x/35

Now 7 more blue balls are put in the box:

Total number of blue balls now = (x+7)

Total balls = 35+7= 42

Probability of getting a blue ball p(E2) =(x+7)/42

A.T.Q

2 p(E1) = p(E2)

So, there are 5 blue balls in the bag initially.

Hope it helps you.