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Counting Basics

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Basic counting principle as a foundation for permutations and combinations.

7.1 Fundamental counting principle

If a task can be done in m ways and another task can be done in n ways, then doing both (in order) can be done in:

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m × n ways

7.2 Quick example

Choosing an outfit:

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3 shirts and 2 pants => 3 × 2 = 6 outfits