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A box has 4 red, 5 blue, and 6 green balls. What is the probability of drawing a non-blue ball?

1. 4/15
2. 9/15
3. 10/15
4. 6/15

Correct answer: 10/15

Solution

Total balls = 4 + 5 + 6 = 15. Non-blue balls = red + green = 4 + 6 = 10, so the probability is 10/15.

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