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?

Answers

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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