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If 3x=a+b+c, then the value of (x-a)^3+(...

If 3x=a+b+c, then the value of
`(x-a)^3+(x-b)^3+(x-c)^3-3(x-a)(x-b)(x-c)` is

A

a+b+c

B

0

C

(a-b)(b-c)(c-a)

D

None of these

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