From the type of inequality:How we can find AM-GM

Algebra Level 4

If $x_{1},x_{2},...,x_{n}$ are reals possitive number such as $2(x_{1}+x_{2}+...+x_{n})\leq 1$ Find minimum value of $(1-x_{1})(1-x_{2})...(1-x_{n})$

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