Multiple choice

A box contains $3$ red, $3$ white and $3$ green balls. A ball is selected at random. Find the probability that the ball picked up is a red ball:

  1. $\displaystyle \frac{1}{4}$
  2. $\displaystyle \frac{1}{3}$
  3. $\displaystyle \frac{1}{2}$
  4. $\displaystyle \frac{3}{4}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total balls = 3 red + 3 white + 3 green = 9. Probability of picking a red ball = Number of red balls / Total balls = 3 / 9 = 1/3.

AI explanation

The total number of balls in the box is the sum of red, white and green balls, which is 3 plus 3 plus 3, equaling 9. The number of favorable outcomes for picking a red ball is 3. By the formula for theoretical probability, the chance of selecting a red ball is the number of red balls divided by the total number of balls, giving 3 divided by 9. This simplifies to 1/3, so the result is 1/3.

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