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The pyramid depicted on the back of the U.S. one-dollar bill consists of 13 rows of bricks. Each row contains a different number of bricks, with the bottom row having 7 bricks, and the rows above decreasing by one brick as you move up. In total, there are 28 bricks in the pyramid.
One
Just the one and it will be the base of the pyramid.
A pyramid need not have any square faces. It can have at most one.
one