Reverse the Triangle

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Six pennies are placed on the table to form a triangle as shown in the uppermost illustration. By sliding one penny at a time, reverse the triangle so that it points in the opposite direction. How many pennies do you have to move?

Now put ten pennies on the table to form a bigger triangle as shown in the lower illustration. Reverse the triangle by sliding one penny at a time. How many pennies do you have to move?

Posted: December 11, 2007
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