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
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!!
1 answer
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