Competition problem — Combinatorics

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Combinatorics Difficulty 1.9 Junior Find the answer

For how many of the given drawings can the six dots be labelled to represent the links between suspects?

Your answer

A number or a short expression. Spacing and $ signs are ignored.

Solution

Two of the five drawings can be labelled to represent the given data.

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Source: Omni-MATH, licensed Apache-2.0. Statement and solution reproduced as published; topic and difficulty added by this site.