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Can someone explain this problem to me, I cannot figure out how they came up with the answer. The example in my book does not work with this problem.

Find the minor for the element in the 1strow and 2ndcolumn.

-3 2 -1
19 13 -18
-19 12 7
correct answer is: -209
The numbers I come up with are not this high. What am I doing wrong?

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