Difference between revisions of "Complementary counting"
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'''Complementary counting''' is [[counting]] the [[complement]] of the [[set]] we want to count, and subtracting that from the total number of possibilities, or the universal set for that particular problem. A big hint that complementary counting may lead to a quick solution is the phrase "at least". | '''Complementary counting''' is [[counting]] the [[complement]] of the [[set]] we want to count, and subtracting that from the total number of possibilities, or the universal set for that particular problem. A big hint that complementary counting may lead to a quick solution is the phrase "at least". | ||
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| + | ==Video== | ||
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| + | This is a video explaining the basics of casework, complementary counting, and overcounting (PIE): | ||
| + | https://youtu.be/Zhsb5lv6jCI | ||
== Examples == | == Examples == | ||
Revision as of 02:28, 22 June 2020
Complementary counting is counting the complement of the set we want to count, and subtracting that from the total number of possibilities, or the universal set for that particular problem. A big hint that complementary counting may lead to a quick solution is the phrase "at least".
Video
This is a video explaining the basics of casework, complementary counting, and overcounting (PIE): https://youtu.be/Zhsb5lv6jCI
