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The system of equations alpha x+y+z=al...

The system of equations
`alpha x+y+z=alpha-1`
`x+alpha y+z=alpha-1`
`x+y+alpha z=alpha-1`
has no solution if `alpha` is(a)

A

1

B

not -2

C

either -2 or 1

D

-2

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The correct Answer is:
D
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