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If the rank of the matrix [[-1,2,5],[2,-...

If the rank of the matrix `[[-1,2,5],[2,-4,a-4],[1,-2,a+1]]` is `1` then the value of `a` is (A) `-1` (B) 2 (C) `-6` (D) 4

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The rank of the matrix [[-1,2,5],[2,-4,a-4],[1,-2,a+1]] is (where a = - 6)

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