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# Nth root

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**Nth root** of a number *r* is a number which, if multiplied by itself *n* times, makes *r*. You could also say that it is a number *k* for which the equation is true:

- [math]k^n=r[/math]

(for meaning of [math]k^n[/math], read exponentiation.)

We write it like this: [math]\sqrt[n]{r}[/math].