Multiple choice

A bag contains 5 black balls, 4 white balls and 3 red balls. If a ball is selected at random, the probability that it is not red is

  1. $\dfrac{5}{12}$
  2. $\dfrac{4}{12}$
  3. $\dfrac{3}{12}$
  4. $\dfrac{3}{4}$
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D Correct answer
Explanation

Total balls = 5+4+3 = 12. The number of non-red balls is 5 (black) + 4 (white) = 9. The probability is 9/12, which simplifies to 3/4.

AI explanation

The total number of balls in the bag is 5 black plus 4 white plus 3 red, equaling 12 balls. The number of balls that are not red is the 5 black balls plus the 4 white balls, which is 9. Using the basic probability formula, we divide 9 by 12 to get a probability of 3/4.

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