Q. 9 D5.0( 2 Votes )

Three unbiased coins are tossed once. Find the probability of getting

at least 2 tails

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 tails. So, the desired outputs are


TTH, THT, HTT, TTT


Total no.of outcomes are 8 and desired outcomes are 4


Therefore, the probability of getting at least 2 tails



Conclusion: Probability of getting at least two tails is


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