Q.
Let a determinant be given by A=a b cp q rx y z and suppose that det. A=6 If B=p+x q+y r+za+x b+y c+za+p b+q c+r then det(B) is
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answer is 12.
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Detailed Solution
We have B=p+x q+y r+za+x b+y c+za+p b+q c+r Apply R1→R1+R2+R3, we get B=2a+p+xb+q+yc+r+za+xb+yc+za+pb+qc+r Apply R2→R2−R1 and R3→R3−R1, we get =2a+p+xb+q+yc+r+z−p−q−r−x−y−z Apply R1→R1+R2+R3∴ det. B=2(6)=12
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