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If one coin is tossed twice then what is the probability of getting atleast one head? explain

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Total 4 outcomes, out of which 1st toss can be head or 2nd toss can be head or both coins show head.................. so 3/4

3/4

Sample space=(TT,TH,HH,HT) REQUIRED=TH,HT,HH P=3/4

3/4