A shoe has twelve eyelets. A shoelace can go through each eyelet in two different ways: one way going in/toward the shoe, and another way coming out/away from the body of the shoe through the eyelet away from the shoe. After we get the shoelace through an eyelet, we must put the shoelace through a different eyelet (in/toward or out/away from the shoe), until the shoelace passes through all twelve eyelets once, and no more than once. How many (different) ways are there to tie the shoelace to the shoe in this procedure?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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A shoe has twelve eyelets. A shoelace can go through each eyelet in two different ways: one way going in/toward the shoe, and another way coming out/away from the body of the shoe through the eyelet away from the shoe. After we get the shoelace through an eyelet, we must put the shoelace through a different eyelet (in/toward or out/away from the shoe), until the shoelace passes through all twelve eyelets once, and no more than once. How many (different) ways are there to tie the shoelace to the shoe in this procedure?

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