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Rule of Product ○◂｜Definition｜1st｜20260207190909-00-⌔
Rule of product
In combinatorics, the rule of product or multiplication principle is a basic counting principle (a.k.a. the fundamental principle of counting). Stated simply, it is the intuitive idea that if there are a ways of doing something and b ways of doing another thing, then there are a · b ways of performing both actions.1
Printed 2026-06-28.
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Link to original Footnotes
McAllister, Alex; Johnston, William (July 27, 2009). A Transition to Advanced Mathematics: A Survey Course. Oxford University Press. ISBN 978-0195310764. ↩
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