1.

Find the minor and cofactor respectively for the element 3 in the determinant = ( begin{vmatrix}1&5 3&6 end{vmatrix} ).

A. M<sub>21</sub>=-5, A<sub>21</sub>=-5
B. M<sub>21</sub>=5, A<sub>21</sub>=-5
C. M<sub>21</sub>=-5, A<sub>21</sub>=5
D. M<sub>21</sub>=5, A<sub>21</sub>=5
Answer» C. M<sub>21</sub>=-5, A<sub>21</sub>=5


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