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A bag contains 4 red marbles, 5 blue marbles, and 3 green marbles. Two marbles are picked at random. What is the fractional probability that 2 red marbles are picked if the first marble was returned before the second was chosen?

User Thyzz
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1 Answer

7 votes

Answer:

Explanation:

Because the first marble was returned before the second was chosen, there are always 4+5+3 = 12 marbles.

Probability of picking 1 red marble = number of red marbles / total number of marbles

= 4/12

= 1/3

Probability of picking 1 red marble two times in a row = Probability of picking 1 red marble * Probability of picking 1 red marble

= 1/3 * 1/3

= 1/9

User Raphael Sauer
by
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