Multiple choice

A jar contains 3 red marbles, 7 green marbles and 10 white marbles. If a marble is drawn from the jar at random, what is the probability that this marble is white?

  1. $\dfrac{1}{2}$
  2. $\dfrac{1}{4}$
  3. $\dfrac{7}{10}$
  4. $\dfrac{3}{10}$
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A Correct answer
Explanation

Total marbles = 3 + 7 + 10 = 20. White marbles = 10. Probability = 10/20 = 1/2.

AI explanation

The total number of marbles in the jar is the sum of the red, green and white marbles, which is 3 + 7 + 10 = 20. Using the classical probability formula, the probability of drawing a white marble is the number of white marbles divided by the total number of marbles. The probability is 10/20, which simplifies to 1/2.

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