SSC Government Jobs Exams Numerical Ability Algebra

If a2 + b2 + c2 = 2 (a-b-c) – 3, then the value of (a – b + c) is-

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The value of k for which the graphs of (k-1) x+y-2 = 0 and (2-k) x -3y + 1 = 0 are parallel is- If x2 + 3x + 1 = 0, then the value of x3 + 1/x3 is-