An opaque pouch holds 3 red marbles and 3 blue marbles. If you draw two marbles at random without replacement, what is the probability that both drawn marbles are the same color? State your answer as a simplified fraction.
2/5
The total number of ways to pick 2 marbles from 6 is 15. The number of ways to draw two of the same color is 3 ways for red plus 3 ways for blue, totaling 6 favorable outcomes. The probability is 6/15, which simplifies to 2/5.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Medium. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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