🧠 GRE Exam Prep

A fair coin is flipped 4 times. What is the probability of getting exactly 3 heads?

A 1/8
B 1/4
C 3/8
D 1/2

✓ Correct Answer: Option B

There are 2^4 = 16 total possible outcomes. The combinations with exactly 3 heads are HHHT, HHTH, HTHH, THHH (4 combinations). Each combination has a probability of (1/2)^4 = 1/16. So, the total probability is 4 * (1/16) = 1/4.

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