Probabilities question?

Question

An urn contains 8 red chips, 10 green chips, and 2 white chips. A Chip is drawn and replaced, and then a second chip is drawn. What is the probability of: a. a white chip first draw? b. a white chip on the first draw and a red on the second? c. two green chips being drawn? d. a red chip on the second, given that a white chip was drawn on the first?

Answer 1

a) 2/20 = .1

b) 2/20 * 8/20 = 16/400 = .04

c) 10/20 * 10/20 = 100/400 = .25

d) 8/20 * 2/20 = 16/400 = .04

Answer 2

A) 2/20= 1/10

the answer is 1/10 chance

B) 1/10 then 2/5

C) 1/2

D) same as B)