Your question is Birthday Duplicate Line Position. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
At a movie theater, the manager gives a free ticket to the first person in line whose birthday matches someone who already bought a ticket. Assuming birthdays are random, what position in line gives the greatest chance of being the first duplicate birthday?