A box contains 4 red, 3 white and 2 blue balls. Three balls are drawn at random. Find out the number of ways of selecting the balls of different colours  Choose the correct choice from the following
A) 12 B) 24 C) 48 D) 168 E) 180
Explanation:   This question seems to be a bit typical, isn't, but it is simplest.   1 red ball can be selected in 4C1 ways   1 white ball can be selected in 3C1 ways   1 blue ball can be selected in 2C1 ways   Total number of ways   = 4C1 x 3C1 x 2C1   = 4 x 3 x 2   = 24   Please note that we have multiplied the combination results, we use to add when their is OR condition, and we use to multiply when there is AND condition, In this question it is AND as   1 red AND 1 White AND 1 Blue, so we multiplied.   Option 24
<result>B</result>
A box contains 4 red, 3 white and 2 blue balls. Three balls are drawn at random. Find out the number of ways of selecting the balls of different colours