A bag contains 7 red and 5 white balls,2 balls are drawn at random without replacement.What is the probability that the second ball is red, knowing the first ball is red?

Answer 1

If you take out a red ball you are now left with 6 red and 5 white So probability of red = 6/11

Answer 2

We start with 12 balls, 7 of them are red.

If the first ball we choose is red, then there are 11 balls left in the bag, and 6 of them are red.

So the probability that the second ball is red, given that the first ball is red, is 6/11.