Answer:
49
Explanation:
You want to know the number of people you need to have in a room before you know for sure 5 have been born in the same month.
Not in the same month
You can have as many as 48 people in the room and only have 4 people born in the same month. (Their birthdays would be distributed so that 4 were born in each month.)
5 in a month
Adding one more person will guarantee that there will be 5 birthdays in one month.
You need to have 49 people in the room to ensure 5 are born in the same month.
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