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"What is the probability of getting more than 4 heads with 6 coins given that you got at least 2 heads?"
This is conditional probability: put A:= Event "getting more than 4 heads" B:= Event "got at least 2 heads" then what are you looking is Now it is clear that Event "getting more than 4 heads": you can want either 5 heads (prob. 6/64) or 6 heads (prob. 1/64). Event "got at least 2 heads": it is the complementary of event "getting more than 4 crosses". "If you roll five dice what is the probability of getting exactly three dice with a "4" and two something with other than a "4"?" You have to choose 3 dices in which you get "4": you can do this in |
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