数学问题概率求解释Rework problem 28 from section 3.4 of your text, in

数学问题概率求解释
Rework problem 28 from section 3.4 of your text, involving the drawing of two
balls from a box of colored balls. Assume the box contains 8 balls:
3 red, 3 blue, and 2 yellow. A ball is drawn and its
color noted. If the ball is yellow, it is replaced; otherwise, it is not.
A second ball is then drawn and its color is noted.
What is the probability that the first ball was yellow, given that the
second was red?

KEY IS 7/27
Anyone know the detailed process?
Thax!