Birthday problem
If I have friends, whose birthdays I dont know, and I can guarantee atleast of my friends have their birthday on the same date , not the year, considering only non leap years, what is minimum value of ?
The answer is 731.
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1 solution
Use of pigeonhole principle.
I must have 3 6 5 × 2 + 1 friends so that I can guarantee atleast 3 friends have same birth date.