Multiple choice

A box contains 5 red, 9 green and 6 black balls. One ball is drawn at random from the box. Find the probability that the ball drawn is a black ball.

  1. 1 4

  2. 3 7

  3. 7 10

  4. 3 10
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total balls = 5 + 9 + 6 = 20. Number of black balls = 6. Probability = 6/20 = 3/10.

AI explanation

The probability of a single event equals the number of favorable outcomes divided by the total possible outcomes. The box contains 5 red, 9 green and 6 black balls, giving a total of 20 balls. The probability of drawing one of the 6 black balls is 6 divided by 20, which simplifies to 3/10.

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