Question

Let $S=\left\{\begin{array}{c}\left[\begin{array}{cc}a_{11}&a_{12}\\a_{21}&a_{22}\end{array}\right]:a_{ij}\ \epsilon\ \{0,1,2\},a_{11}=a_{22}\end{array}\right\}$. Then the number of non-singular matrices in the set S is:
(a) 27
(b) 24
(c) 10
(d) 20

Answer 1

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