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Close Quarters

by Kevin J. Lin

Take two ordinary U.S. quarters and touch them together. Tough, huh?

Now take a third quarter and position it in a fashion so that it touches the other two. How many quarters can you add so that each quarter touches every other quarter?

For those of you outside the U.S., or in extreme poverty, a quarter is a circlular coin about 2.4 cm in diameter, and a thickness of about .15 cm.

See the Solution

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