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

A

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

B

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

C

`2nc^(1/n)`

D

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

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The correct Answer is:
A
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