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

Answer:

$\frac{25}{72}$

Step-by-step explanation:

$( { \frac{3}{12}) }^{2} + { (\frac{4}{12}) }^{2} + { (\frac{5}{12}) }^{2} = \frac{50}{144} = \frac{25}{72}$