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Let the system of linear equations x + 2y + z = 2, αx + 3y – z = α, -αx + y + 2z = -α be inconsistent. Then a is equal to :

(A) 5/2 

(B) -5/2 

(C) 7/2 

(D) -7/2

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Correct option is (D) -7/2

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