Multiple choice

When 4 fair coins are tossed together what is the probability of getting at least 3 heads?

  1. 1/4

  2. 3/4

  3. 5/16

  4. 3/8
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

With 4 fair coins, total outcomes = 2^4 = 16. 'At least 3 heads' means either 3 heads or 4 heads. Number of ways to get exactly 3 heads = 4C3 = 4. Number of ways to get exactly 4 heads = 4C4 = 1. Total favorable outcomes = 4 + 1 = 5. Probability = 5/16.

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