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Two coins are tossed. What is the probab...

Two coins are tossed. What is the probability of coming up two heads if it is known that at least on head comes up.

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Sample = `{HH,HT,TH,T T}=4`

At least one head comes up `4−1=3`

Both heads comes up` =1`

Probability of both heads comes up`=1/3```

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