What is the probability of obtaining exactly four heads when flipping a fair coin six times?

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1/64

15/64

Correct

5/16

3/8

1/2

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Official Explanation

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To find the probability of getting exactly four heads in six flips of a fair coin, we can use the binomial probability formula. The specific outcome of four heads and two tails, such as HHHHTT, can occur in multiple arrangements. The formula is given…

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Comments

NathanOct 21, 2024

This is definitely a test-day trap

EndeJan 27, 2025

good question

What this question tests

What it tests

Whether you can count arrangements and selections correctly — permutations vs. combinations.

Common trap

Overcounting: treating a selection as ordered when order does not matter, or forgetting to divide by duplicates.