Question

There is a bag filled with 5 blue, 6 red and 2 green marbles.

A marble is taken at random from the bag, the colour is noted and then it is not replaced.
Another marble is taken at random.
What is the probability of getting 2 different colours?

Answer 1

Answer: 11/156

Step-by-step explanation: There are 13 marbles at the beginning, and 12 at the end.

13 x 12 = 156

Since there are 2 marbles being picked from the 13, subtract 2 from 13.

13-2 = 11

The probability of choosing different colors is 11/156.