Given a set of items, this calculates the total number of groups/choices that can be formed using the rule of product.

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- Total Choices = n
_{1}* n_{2}* n_{3}*and ... * n_{k}

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- counting
- taking account of when reaching a total; including
- fundamental rule of counting
- If there are m ways to do one thing, and n ways to do another, then there are m*n ways of doing both

Total Choices = n_{1}* n_{2}* n_{3}* ... * n_{k} - product
- The answer when two or more values are multiplied together