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inequality with natural parameters

Source: S&M 2002 3&4th Grade P1

May 15, 2021
inequalities

Problem Statement

For any positive numbers a,b,ca,b,c and natural numbers n,kn,k prove the inequality an+kbn+bn+kcn+cn+kanak+bk+ck.\frac{a^{n+k}}{b^n}+\frac{b^{n+k}}{c^n}+\frac{c^{n+k}}{a^n}\ge a^k+b^k+c^k.