what is the probability of your friend's birthday also in december
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Step-by-step explanation:
A person can have birthday in any of the 12 months of the year.Another person can also have his/her birthday in any of the 12 months.Now,the total number of possible combinations is 12*12 , which equals 144.
This set of all possible combinations contains 12 pairs of identical months {for example(Jan,Jan)},which are our favorable outcomes.
Thus the probability =
(Number of favorable outcomes)/(Number of events in sample space)=
12/(12*12)=1/12
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