Difference between revisions of "Complementary counting"
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'''Complementary counting''' is counting what we don't want, and substracting that from the total number of possibilities. A big hint that complementary counting may lead to a quick solution is the phrase "at least". | '''Complementary counting''' is counting what we don't want, and substracting that from the total number of possibilities. A big hint that complementary counting may lead to a quick solution is the phrase "at least". | ||
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== Examples == | == Examples == | ||
| + | === Introductory === | ||
| + | * [[2006_AMC_10A_Problems/Problem_21 | 2006 AMC 10A Problem 21]] | ||
| + | * [http://www.artofproblemsolving.com/Forum/resources.php?c=182&cid=45&year=2002&p=378321 AIME 2002I/1] | ||
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=== See also === | === See also === | ||
Revision as of 12:04, 23 July 2006
Complementary counting is counting what we don't want, and substracting that from the total number of possibilities. A big hint that complementary counting may lead to a quick solution is the phrase "at least".
Examples
Introductory
