There are 5 white and 4 black balls in the urn. 2 balls are drawn from it in a row. Find the probability that both balls are white.

There are 5 white and 4 black balls in the urn. 2 balls are drawn from it in a row. Find the probability that both balls are white. if the balls are not withdrawn and a white ball appears at the first withdrawal.

After removing 1 white ball, 4 white and 4 black balls remain in the urn.
Let’s calculate the fraction of the remaining balls of each color in the urn:
4 white balls / 8 balls = 0.5
4 black balls / 8 balls = 0.5
The total number of balls is taken as 100%. Accordingly, the probability that the second ball drawn will turn out to be white is 50%.