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We prove that for any infinite right-angled Coxeter or Artin group, itsspherical and geodesic growth rates (with respect to the standard generatingset) either take values in the set of Perron numbers, or equal $1$. Also, wecompute the average number of geodesics representing an element of given wordlength in such groups.

Spherical and geodesic growth rates of right-angled Coxeter and Artin groups are Perron numbers