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Ten test papers are to be prepared for the Gonitzoggo Calibration Round. Each paper has $4$ problems, and no two papers have more than $1$ problem in common. At least how many problems are needed?
Combinatorics
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Ten test papers are to be prepared for the Gonitzoggo Calibration Round. Each paper has $4$ problems, and no two papers have more than $1$ problem in common. At least how many problems are needed?
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