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((m-n)^(3)+(n-r)^(3)+(r-m)^(3))/(6(m-n)(...

`((m-n)^(3)+(n-r)^(3)+(r-m)^(3))/(6(m-n)(n-r)(r-m))=?`

A

`(1)/(2)`

B

`(1)/(3)`

C

`(1)/(5)`

D

`(1)/(6)`

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