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Suppose a1,a2, real numbers, with a1!=0...

Suppose `a_1,a_2,` real numbers, with `a_1!=0,` If `a_1,a_2,a_3` are in `AdotPdot` then (a)`A[a_1a_2a_3a_4a_5a_6a_5a_6a_7]` is singular (b)the system of equations `a_1x+a_2y+a_3z=0,a_4x+a_5y+a_6z=0,a_7x+a_8y+a_9z=0` has infinite number of solutions. (c)`B=[a_1i a_2i a_2a_1]` is non singular (d)none of these

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