A box contains two black balls and three white balls Two bal

A box contains two black balls and three white balls. Two balls are randomly drawn one after one without replacement. Determine the probability that:

a) both drawn balls are white

b) one ball is white and one ball is black

c) at least one of two drawn balls is black

d) the second draw shows a white ball given that the first draw shows a white ball

Looking for shown work. For a) I got 0.3 and for b) 0.3 as well. c) I am not sure how to do, and d) as well.

Solution