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Only 20.
Only 20.
There are 3780 different arrangements.
There are 172 different arrangements.
64 different arrangements are possible.
There are 6! = 720 different arrangements.
There are 7!/(2!*2!) = 1260 arrangements.
6! = 6x5x4x3x2x1 = 720 arrangements
There are 5!/2! = 60 arrangements.
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