Question

1. In a one bag 5 white balls and remaining are blue. If

probability of blue ball will be twice of probability of white

ball, then find probability of selected blue balls from bag​

Answer 1

Answer:

Let number of blue balls =x

Total number of balls =5+x

Probability for a white ball =

x+5

5

Probability for a blue ball =

5+x

x

According to the question

5+x

x

=2(

x+5

5

)⇒x=10

∴ Number of blue balls =10.