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