Question

A bag contains 6 white and 4 black balls. Two balls are drawn at random. The probability that they are of the same colour, is

Answer 1

In the attachment I have
Solved this problem.

I hope this answer help you

Answer 2

The Given condition would be satisfied if
1. Both the balls  drawn are white2. Both the balls drawn are Black
Required Probability = P( Both the balls are white) + P(Both the balls are Black)
    = 6/10 × 5/9 + 4/10×3/9    = 42/90    = 7/15
So, The Probability is 7/15