Q 1137245182.     If `a_1,a_2,.......a_n` are positive real numbers whose product is a fixed number c, then find the minimum value of `a_1+a_2+.......a_(n−1)+2a_n`

A

`n(2c)^(1/n)`

B

`2nc^(1/n)`

C

`(n+1)c^(1/n)`

D

`(n+1)(2c)^(1/n)`

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