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Let A,G,H and S respectively denote the ...

Let A,G,H and S respectively denote the arithmetic mean, geometric mean, harmonic mean and the sum of the numbers `a_1,a_2,a_3……..a_n`. Then the value of x at which the function `f(x)=sum_(k=1)^n(x-a_k)^2` has minimum is

A

S

B

H

C

G

D

A

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The correct Answer is:
D
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