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An urn contains 8 red chips, 10 green chips, and 2 white chips

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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?