You know what it looks like… but what is it called?
TAKE THE QUIZ“of three”
We have one entry that includes the term of three.
rule of three
: a rule in mathematics: the product of the means in a proportion equals the product of the extremes —used for finding the fourth term of a proportion where three are given
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- Before we went to her house, Hannah told us her aunt was a flibbertigibbet.


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Merriam-Webster unabridged