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  4. A fair coin is tossed three times. If it is known that atleast one head has occurred, the probability that atleast one tail has occurred, is equal to

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Q. A fair coin is tossed three times. If it is known that atleast one head has occurred, the probability that atleast one tail has occurred, is equal to

Probability - Part 2

Solution:

$ n ( S )=7 ;[8-\{ T TT \}] ; E =\{ THH \text { or } THT \}=6 $
$ n ( E )=6 \Rightarrow p =\frac{6}{7} $