Question

A bag contain 6 black,5blue,4 pink balls.If 3 balls are drawn one by one with replacement,then what is the probability that all the balls are blue

Answer 1

There are total 15 balls in a bag
All are blue balls
Probability is
5/15=1/3

Answer 2

Probability of black balls =6/15.

Probability of blue balls=5/14.

probability of pink balls =4/13.

Now adding all the probabilities ,we get

6/15+5/14+4/13=35/39

or 35/39 =0.897435...... .