If $a,\,b,\,c$ are in $A.P.$, then $(a + 2b - c)$ $(2b + c - a)$ $(c + a - b)$ equals

  • A

    $\frac{1}{2}abc$

  • B

    $abc$

  • C

    $2\ abc$

  • D

    $4\ abc$

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