A fair coin is tossed 3 times. What is the probability of getting exactly 2 heads?
Show the answer and explanation
Correct answer
B. 3/8
Principle or equation
For equally likely outcomes, probability = number of favorable outcomes / total outcomes. Count combinations.
Why this answer is correct
Total outcomes = 2^3 = 8. Favorable outcomes with exactly 2 heads: HHT, HTH, THH, so 3. Probability = 3/8.
Example
For 2 tosses, exactly 1 head: HT, TH, probability 2/4 = 1/2.
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