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In rows (1, 2, 3), (4, 5, 6), (7, 8, 9), what is the cofactor of 6?
A8
B6
C-6
D-8
Answer & Solution
Correct answer: B. 6
The minor is -6 and the position (2,3) sign is -1, so the cofactor is (-1)(-6) = 6.
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