There are 5 red and 5 black balls in the urn.
Let’s say the ball drawn in the first attempt is red.
The urn now holds 7 red and 5 black balls with the addition of two balls of the same colour (red).
Let’s say the ball sketched in the first try is black in colour.
The urn now includes 5 red and 7 black balls, as well as two balls of the same colour (black).
As a result, the probability of drawing the second red ball is: