Question

If a ball is drawn from 2 bags find the probability that the balls are of different colour

Answer 1

First Plz See Attachment

The best way to think of this is:

There are 15 chances out of 56 of getting a white then a black and

there are 15 chances out of 56 of getting a black then a white so that

there are 30 chances out of 56 of getting one of each colour