3
Answer: CSet 3: Probability (Beginner)
Explanation
PROBLEM
A bag contains 21 balls, 10 of which are white. What is the probability of randomly selecting a white ball?
A bag contains 21 balls, 10 of which are white. What is the probability of randomly selecting a white ball?
A.
10/22
B.
11/21
C.✓ Correct
10/21
D.
11/21
Detailed Explanation
Choice C is the best answer. P = favorable/total = 10/21 = 10/21
Why others are wrong:
A: 10/22 is incorrect because it does not satisfy the equation.
B: 11/21 is incorrect because it does not satisfy the equation.
D: 11/21 is incorrect because it does not satisfy the equation.