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A bag contains 2 white marbles and 7 purple marbles. 2 marbles are drawn at random.

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Answer:

7/36

Explanation:

Complete

A bag contains 2 white marbles and 7 purple marbles. Two marbles are drawn at random. One marble is drawn and not replaced. Then a second marble is drawn. What is the probability of selecting a purple marble and then a white marble?

Total outcome = 2 + 7 = 9marbles

Pr(picking purple) = number of purple/total outcome

Pr(picking red) = 7/9

Since the first marble is not replaced, the total outcome becomes 8 marbles

Pr(picking white) = 2/8 = 1/4

Probability of selecting a purple marble and then a white marble = 7/9 * 1/4 = 7/36

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