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Counting Principles

Reference > Mathematics > Algebra
How to determine the number of ways in which two or more events can happen
How to count events when one event affects the next
Permutations - Explanation and mathematical formula for number of arrangments
Calculate the number of permutations if there are repeated objects
Combinations - how to count arrangements when order doesn't matter

Understanding Coronavirus Spread

A Question and Answer session with Professor Puzzler about the math behind infection spread.

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