3
Answer: DSet 1: Probability (Beginner)
Explanation
PROBLEM
A bag contains 21 balls, 18 of which are green. What is the probability of randomly selecting a green ball?
A bag contains 21 balls, 18 of which are green. What is the probability of randomly selecting a green ball?
A.
6/21
B.
15/21
C.
7/6
D.✓ Correct
6/7
Detailed Explanation
Choice D is the best answer. P = favorable/total = 18/21 = 6/7
Why others are wrong:
A: 6/21 is incorrect because it does not satisfy the equation.
B: 15/21 is incorrect because it does not satisfy the equation.
C: 7/6 is incorrect because it does not satisfy the equation.