Toss two fair coins, blindfolded. somebody tells you that you tosses at least one heads. what is the probability that both tosses are heads

There are 2² options when you flip a coin twice; 

P(HH)=(1×1/2) <-- knowing that at least 1 of your tosses is head so you say 1

Hence, the chance of both of your tosses being heads is 1/2. 

Hope I helped :) 

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