SOLUTION: 1149 people are in an auditorium. Based on that fact alone, we know at least n of them were born in a year with the same last digit. What is n?

SOLUTION: 1149 people are in an auditorium. Based on that fact alone, we know at least n of them were born in a year with the same last digit. What is n?

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Question 895093: 1149 people are in an auditorium. Based on that fact alone, we know at least n of them were born in a year with the same last digit.
What is n?
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
1149/10 = 114.9

Therefore it is guaranteed that 115 people have a birth year with the same units digit, by Pigeonhole.
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