Asked by Ashanti

What is the probability of obtaining exactly three heads in four flips of a coin, given that at least two are heads? (Enter the probability as a fraction.)

I keep getting 2/3 but its wrong. Help!!
Answered by Damon
two are already decide. You have two more flips. What is the chance of getting one heads and one tails out of those two flips ?

You have four possibilities
HH
HT
TH
TT

two of those four work, TH and HT
so I get 1/2
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