Question

There is a bag filled with 3 blue, 4 red and 5 green 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 the same colour?​

Answer 1

`(25)/(72)`

Explanation:

`( { (3)/(12)) }^(2) + { ((4)/(12)) }^(2) + { ((5)/(12)) }^(2) = (50)/(144) = (25)/(72)`