Math Olympiad for Elementary | 2018 | Division E | Contest 2 | MOEMS | 2D

Problem: The place cards shown are folded along the dotted
line so that only a number or letter is visible.
Chrissy enters the room and sees all five place
cards, some with numbers showing and some with
letters showing. The numbers that she sees add up to 10. How many different sets of
numbers are possible?

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