rule of three

rule of three

noun Mathematics.
the method of finding the fourth term in a proportion when three terms are given.

Origin:
1585–95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Rule of three is always a great word to know.
So is square. Does it mean:
the second power of a quantity, expressed as a2 = a ? a, where a is the quantity
the smallest number that is a common multiple of a given set of numbers
Collins
World English Dictionary
rule of three
 
n
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 10th Edition
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