Find the determinant of the matrix. Expand by cofactors using the indicated row or column. 1. (a)

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Find the determinant of the matrix. Expand by cofactors using the indicated row or column.
1.
5] 6. 3

(a) Row 1
(b) Column 1
2.

-1] 10 4.

(a) Row 2
(b) Column 2
3.

(a) Row 2
(b) Column 2

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