Asked by Jessica

A fair coin is flipped four times. What is the probability that tails occurs exactly 3 times if it is known that tails occurs at least twice?
Answered by Reed
Where did you get this question from?
Answered by Reiny
The last part of the sentence " if it is known that tails occurs at least twice?" contradicts the first part.

ignoring that last part we would have:
C(4,3)(1/2)^3 (1/2)
= 4 (1/16) = 1/4
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