Nine dots - Math Central

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Question from al:

Connect the dots.
There is nine dots, three across and three down.
Connect the nine dot with the pencil only using four line and never lifting the pencil off of the paper.

Hi Al,

Suppose you had 4 dots in this configuration.

4 dots

Can you connect them using two lines and never lifting the pencil off of the paper?

Stephen and Harley

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