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4. Test whether the following matrices are nonsingular: O L O 4 (a) 19 - (c) 7 1 13 4 WO - OW -4 9

4. Test whether the following matrices are nonsingular: O L O 4 (a) 19 - (c) 7 1 13 4 WO - OW -4 9 ( b) -5 OAN (d) 3 0 10 8 6 5. What can you conclude about the rank of each matrix in Prob. 4

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