20. Let a [a,...an], b= following is false. A= 2a bn and B [6 26 36]....

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20. Let a [a,...an], b= following is false. A= 2a bn and B [6 26 36]. Determine which of the = b (a) Columns of AB are L-D (b) ABr=0 has nontrivial solutions. (c) Columns of BT AT are L-D. (d) (AB)=0 has nontrivial solutions. (e) none of these 20. Let a [a,...an], b= following is false. A= 2a bn and B [6 26 36]. Determine which of the = b (a) Columns of AB are L-D (b) ABr=0 has nontrivial solutions. (c) Columns of BT AT are L-D. (d) (AB)=0 has nontrivial solutions. (e) none of these