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If `S` is the set of distinct values of `' b` for which the following system of linear equations `x+y+z=1` `x+a y+z=1` `a x+b y+z=0` has no solution, then `S` is : a finite set containing two or more elements (2) a singleton an empty set (4) an infinite set

A

am empty set

B

an infinite set

C

a finite set containing two or more elements

D

a singleton

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The correct Answer is:
D
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