Question

There is a bag filled with 5 blue and 4 red marbles.

A marble is taken at random from the bag, the colour is noted and then it is replaced.
Another marble is taken at random.
What is the probability of getting 2 blues?

Answer 1

total balls 5+4 = 9

Probability of getting blue ball in the first try

=
`(5)/(9)`

After replacing, total number of balls = 9

Probability of getting blue ball in the second try

`= (5)/(9)`

Therefore probabilty of getting 2 blue balls

=
`(5)/(9)*(5)/(9) =(25)/(81)`