Counting PrinciplesReference > 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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