Answer :

We know that,


Probability of occurrence of an event


Let T be tails and H be heads


Total possible outcomes = TTT, TTH, THT, HTT, THH, HTH, HHT, HHH


Desired outcomes are at least two heads or at most two tails. So, desired outputs are TTH, THT, HTT, THH, HTH, HHT, HHH


Total no.of outcomes are 8 and desired outcomes are 7


Probability of getting at most 2 tails or at least 2 heads


Conclusion: Probability of getting at least two heads or at most two tails is


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