Given the pair of equations ax + (a - 1) y = 1 and (a + 1) x - ay = 1, for which one of the following values of a is there no common solution of the given pair of equations?

a + - root 2 b. +- 1 / root 2 c. + - 2 d. 1 + - 1 / 2

  • -2
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