A group should consist of 13 people in order to ensure that at least two of the group members have birthdays that are in the same month.
Given:
This problem is an example of pigeonhole principle which states that If n+ 1 objects are placed into n boxes, then some box contains at least 2 objects.
Here no. of months in a year are boxes n = 12.
Therefore number of objects( people) = n+1= 13.
Then, at least two people in the group whose birthdays fall in the same month.
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