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rule of three

noun, Mathematics
1.
the method of finding the fourth term in a proportion when three terms are given.
Origin
1585-1595
1585-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for rule of three
  • If public notice, decide whether to use category ranking or rule of three.
  • Candidates cannot be eliminated after three considerations as with the rule of three.
  • Candidates are selected off of the eligible list using the rule of three.
British Dictionary definitions for rule of three

rule of three

noun
1.
a mathematical rule asserting that the value of one unknown quantity in a proportion is found by multiplying the denominator of each ratio by the numerator of the other
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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