8. The value of k, for which is a singular is: a. ± 4 b. ± 5 C. ± 7 d. ± 6 A= 28 [k 14 2k 9. If A is a square matrix of order 3 and |A| = 5, then the value of |2AT| is: a. 40 b. 20 C. 80 d. 160 10. If A, B, and C are square matrices of order 3, and |A| = 4, Then the value of 14 (ABC)-¹ | is: a. 1 b. 4 ةن C. 16 d. 1/4 |B|=2, |C|= 8

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