Probability Puzzles
Hard
2 min
Three fair coins are tossed. What is the probability of getting at least one head?
Hint
Find the complement: no heads.
Answer
7/8.
Explanation
There are 8 equally likely outcomes. Only TTT contains no heads, so 7 outcomes contain at least one head.
Step-by-Step Solution
P(no heads) = 1/8.
P(at least one head) = 1 - 1/8 = 7/8.
P(at least one head) = 1 - 1/8 = 7/8.