6. If there are 12 strangers in a room, what is the probability that no two of them celebrate their birthday in the same month?
Each of the 12 persons can have his birthday in any of the 12 months
Therefore total no of ways of assigning 12 months to 12 people = 12 ^ 12
(^ denotes to the power of)
This is explained below
January can be assigned to 12 ...
Answers a probability question