Multiple choice

If two fair coins are flipped and at least one of the outcomes is known to be a head, what is the probability that both outcomes are heads?

  1. 1/3

  2. 1/4

  3. 1/2

  4. 2/3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sample space = {HH, HT, TH} Required probability =$\dfrac{1}{3}$

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