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teacher gave each of her 37 students 36 pencils in different colors

Source: : Czech-Polish-Slovak Junior Match 2018, individual p3 CPSJ

February 1, 2020
Coloringcombinatorics

Problem Statement

The teacher gave each of her 3737 students 3636 pencils in different colors. It turned out that each pair of students received exactly one pencil of the same color. Determine the smallest possible number of different colors of pencils distributed.