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inequality in 2021 China Second Round A2

Source: 2021 China Second Round A2

February 20, 2023
inequalities

Problem Statement

Given n2n\geq 2, a1a_1, a2a_2, \cdots, anRa_n\in\mathbb {R} satisfy a1a2an0,a1+a2++an=n.a_1\geqslant a_2\geqslant \cdots \geqslant a_n\geqslant 0,a_1+a_2+\cdots +a_n=n. Find the minimum value of a1+a1a2++a1a2ana_1+a_1a_2+\cdots +a_1a_2\cdots a_n.