Consider 3 urns. urn a contains 2 white and 4 red balls, urn b contains 8 white and 4 red balls, and urn c contains 1 white and 3 red balls. if 1 ball is selected from each urn, what is the probability that the ball chosen from urn a was white given that exactly 2 white balls were selected?

0.636

Explanation:

Given

Urn A contains 2 W, 4 R

Urn B contains 8 W, 4 R

Urn C contains 1 W,  3 R

Probability of selecting 3 balls out of which 2 are white

P(J)=P(WWR)+P(WRW)+P(RWW)

Probability that the ball chosen from Urn A was white given that exactly 2 white balls  were selected

i.e.

its d i know cause i've been googling it