Solution: 2022-13 Inequality involving sums with different powers

Prove for any x1 that

(n=0(n+x)2)22n=0(n+x)3.

The best solution was submitted by 김기수 (KAIST 수리과학과 18학번, +4). Congratulations!

Here is the best solution of problem 2022-13.

Another solution was submitted by 김찬우 (연세대학교 수학과, +3).

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