Question 486566
1. P(B given A) = P(A and B)/P(A)
P(BG given DW) = 0.2 / 0.5 = 0.4
2. 5 are red, 15 not so much.
First is not red: 15/20 = 3/4
And (implies Times) second is not red = 14/19
Answer = (3/4) * (14/19) = (3*7)/(2*19) = 21/38.