Hi; I'm having trouble with this question. Three coins are tossed what is the probability of getting three heads if it is known that at least two heads were obtained? Thanks.
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Originally Posted by anthonye three coins are tossed what is the probability of getting three heads if it is known that at least two heads were obtained? $\displaystyle \\thh\\hth\\hht\\hhh$
So the answer is 1/2. I just want confirmation because my book says 1/4.
OH also the formula is it P(A given B) = (A and B)/P(B) I sure this is correct but whats P(A and B) in this question. Thanks.
Originally Posted by anthonye So the answer is 1/2. NO! Plato showed four ways you could have "at least two heads" and only one of them has three heads. The "probability of three heads" given that "you have at least two heads" is 1/4. I just want confirmation because my book says 1/4.
Ok thank you I went and looked at it again I see now. Thank you both.
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