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## Homework Statement

It is decided to label the vertices of a rectangle with the letters A, B, C and D.

In how many ways is this possible if:

a) they are to be in clockwise alphabetical order

b) they are to be in alphabetical order

c) they are to be in random order

## Homework Equations

## The Attempt at a Solution

How do I solve for c? What is the logic behind C?