180 Days of Ideas for Discussion in Math Class.
(as of 9July2014, we're in overtime!)

Wednesday, April 29, 2015

448: Hexagon Puzzle

Why did the puzzle creator only ask for circles A and B?

In the diagram, the 19 circles are to contain the integers 1 to 19 once each.
The sum total along any of the lines is 38.
Determine the integers in circles A and B.

Asking for only two

ReplyDelete⒜ is sufficient to determine whether someone "figured it out".

⒝ makes for faster marking on an exam.

There is no deeper rationale.