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Who is who?

Who is who?

Friendship relationships between 6 people are represented by the following graph in which each person occupies a circle.

In addition, we know that:

  • Alan has 3 friends: Barney, Charlie, and Daniel.
  • Barney and Ed are both friends of Charlie.
  • Ed is Frank's only friend.

What is the position of each person on the chart?

Seen at wild.maths.org.

Solution

This is the solution: