Set 4: Probability (Beginner)

**Choice B is the best answer.** P = favorable/total = 7/21 = 1/3

Explanation

Answer: B

PROBLEM

A bag contains 21 balls, 7 of which are green. What is the probability of randomly selecting a green ball?

2/3

1/3

✓ Correct

20/21

1/21

Detailed Explanation

Choice B is the best answer. P = favorable/total = 7/21 = 1/3

Why others are wrong:

A: 2/3 is incorrect because it does not satisfy the equation.

C: 20/21 is incorrect because it does not satisfy the equation.

D: 1/21 is incorrect because it does not satisfy the equation.