(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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

2. Relevant equations

3. The attempt at a solution

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

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# The Product Principle

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