Free Practice Question
PS · Problem Solving
sub-505
Probability
Three friends, Alice, Bob, and Charlie, tossed a fair coin 4 times, and it resulted in 'heads' each time. Charlie predicts that the next toss will result in 'tails'. What is the probability that Charlie's prediction is correct?
Answer Choices
Correct answer marked belowA
1
B
2/3
1/2
Correct
D
1/4
E
3/5
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Explanation
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Official Explanation
Official
The coin has landed on heads 4 times in a row. However, since the coin is fair, the probability of getting tails on any single flip…
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Comments
2
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A
AdvitiyaSep 19, 2024
thank you for sharing
T
TvMar 18, 2025
appreciated!
What this question tests
What it tests
Your ability to compute probabilities of single and compound events, including 'at least one' questions.
Common trap
Forgetting to use the complement for 'at least one', or treating dependent events as independent.
Details
Difficulty
sub-505
Type
PS
Category