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The system of linear equations 3x + y -z...

The system of linear equations `3x + y -z = 2, x - z =1 and 2x + 2y + az=5 ` has unique solution when

A

`a ne 3`

B

`a ne 4`

C

`a ne 5`

D

`a ne 2`

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The correct Answer is:
D
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