Question

In a magical country, there are coins worth `1`, `2`, `3` and `5` liras. Yossi has `25` coins from the magical country.

Must there necessarily be `7` coins of the same value among these coins?

Difficulty level (1 very easy - 10 very hard): 2

Topics:
Combinatorics -> Pigeonhole Principle Combinatorics -> Case Analysis / Checking Cases -> Processes / Procedures
Sources:
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