dsing properties of determinant prove that :-  determinant [ (mC1   mC2     mC3) , (nC1  nC2  nC3),(pC1  pC2  pC3)]= {mpn(m-n)(n-p)(p-m)}/12.  determinant is of order 3*3 .

  

R2 → R2 – R1 and R3 → R3 – R1 

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