Probability Puzzles
Medium
2 min
A bag contains 4 red and 6 blue balls. Two balls are drawn without replacement. What is the probability that both are blue?
Hint
After one blue is drawn, 5 blue balls remain among 9 balls.
Answer
1/3.
Explanation
The probability is 6/10 × 5/9 = 30/90 = 1/3.
Step-by-Step Solution
P(first blue) = 6/10.
P(second blue) = 5/9.
Product = 1/3.
P(second blue) = 5/9.
Product = 1/3.