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NDA2012MathematicsDeterminantsActual

If the matrix [ array ccc & 2 & 2 -3 & 0 & 4 1 & -1 & 1 array ] is not invertible, then :

Options

  1. A=-5
  2. B=5
  3. C=0
  4. D=1

Correct answer

A. =-5

Step-by-step solution

[ array ccc & 2 & 2 -3 & 0 & 4 1 & -1 & 1 array ]=0 aligned & (0+4)-2(-3-4)+2(3-0)=0 & 4 +14+6=0 aligned 4 =-20 =-5 .

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