Section 8.6 Counting Principles

Before Starting this Section, Review

  1. 1 Exponents (Section P.2 , page 20)

  2. 2 Factorials (Section 8.1 , page 721)


  1. 1 Use the Fundamental Counting Principle.

  2. 2 Use the formula for permutations.

  3. 3 Use the formula for combinations.

  4. 4 Use the formula for distinguishable permutations.

The Mystery of Social Security Numbers

Social Security numbers may seem to be assigned randomly, but they are not. Although the details are complicated, here is a brief introduction: First, the format for all Social Security ...

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