Question discussion

What is the minimum number of persons that must be chosen to guarantee that at least two of them were born in the same month of the year?

2105Medium DSSSB TGT Computer Science 0 replies 1 views

Correct answer: A

Explanation

By the pigeonhole principle, 12 persons could all have different birth months, so 12 + 1 = 13 persons guarantee a repeat.

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