A = [2 3]

[1 9]

(A) det (A) = (2) (9) - (1) (3)

(B) det (A) = (2) (9) + (1) (3)

(C) det (A) = (2) (3) - (1969)

(D) det (A) = (2) (3) + (1) (9)

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