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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? |
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