Rule of three

English

Alternative forms

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Proper noun

1. Template:Lb A rule stating that, if two ratios are equal, then the denominator of the second equals its numerator times the reciprocal of the first ratio: if $\frac{a}{b}=\frac{c}{d}$ then $d=\frac{bc}{a}$.
2. Template:Lb A rule for clinical trials used for determining the rate of adverse side effects when no such side effects present during the course of the trial.
3. Template:Lb A rule which states that things which come in groups of three are inherently funnier or more effective than things which come in groups of other sizes.
   1. Template:Lb Specifically, the technique of having a setup in advance, a reminder to keep it fresh in the audience's memory, and then a payoff.
4. Template:Lb A religious tenet stating that the energy a person puts out into the world, positive or negative, will be returned to that person threefold.
5. Template:Lb A rule of thumb in the C++ programming language, stating that any class that defines a destructor, a copy constructor, or a copy assignment operator should define all three of them.

Translations

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• Tagalog: Template:T

See also

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Further reading

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