What is the minimum number of people you need to invite to a festive evening
| August 2, 2021 | education
What is the minimum number of people you need to invite to a festive evening so that there are guaranteed to find ten people whose birthdays were in the same month?
There are 12 months in a year: January, February, March, April, May, June, July, August, September, October, November, December.
If there are 9 birthday people in each month, then we need to invite 9 * 12 = 108 people.
Therefore, in order to guarantee at least 10 birthday people in one month, we need to invite 1 more guest.
108 + 1 = 109.
Answer: 109 invitees.
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