People of different ages who share the same birthday
104375
Word for two people who are the same age
96195
Can we have multiple  in same ?
123137
Recursion: putting people into groups of 1 or 2
71222
probability question ("birthday paradox")
45300
How to prevent duplicate usernames when people register?
113600
Percentage of 2 different Sets of Birthday Out of 14 People
142430
Number of handshakes
81087
Can the birthday attack be extended in this case?
127137
Birthday line to get ticket in a unique setup
136449
Combinatorics problem on $20$ people, $12$ months, and distinguishable groups
50179
Probability of two people meeting
98415
Getting Acquaintances to become Friends
9508
How to reply to one user among two having same names?
118407
Birthday Problem applied to collisions
40852
Number of ways of distributing $n$ identical objects among $r$ groups
70793
Person, Persons, People, Peoples
95939
Combinations of 6 students among 20, at least one male