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If `a-1,a_2, ,a_n` are positive real numbers whose product is a fixed number `c ,` then the minimum value of `a_1+a_2++a_(n-1)+2a_n` is `a_(n-1)+2a_n` is b. `(n+1)c^(1//n)` `2n c^(1//n)` `(n+1)(2c)^(1//n)`

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