Three unbiased coins are tossed.what is the probability of getting-

  1.  two heads?
  2. at least two heads?
  3. at most two heads?

Dear Student!
Here is the answer to your question.

The sample space obtained while three unbiased coins are tossed is given by {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}, where H means the head appears and T means the tail appears.
 
Thus, a total of 8 outcomes is obtained when three unbiased coins are tossed.
 
The outcomes of the event, getting exactly two heads are HHT, HTH and THH.
There are 3 outcomes of the event getting exactly two heads by tossing three unbiased coins.


Cheers!
 

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