If a matrix is given by A = \(\left[ {\begin{array}{*{20}{c}} 1&2&3\\ – McqOptions

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1.	If a matrix is given by A = \(\left[ {\begin{array}{*{20}{c}} 1&2&3\\ 0&4&5\\ 0&0&1 \end{array}} \right]\) , then the determinant of A-1 is:
A.	3
B.	\(\frac{1}{3}\)
C.	\(\frac{1}{4}\)
D.	4
Answer» D. 4

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