CBSE Class 12 Math 2008 Solved Paper

Question : 5 of 29

Marks: +1, -0

Find the co-factor of

a_{12}

in the following:

|\table 2,-3,5;6,0,4;1,5,-7|

Solution:

|\table 2,-3,5;6,0,4;1,5,-7|

Cofactor of

a_{12}

(-1)^{1 + 2}

[6(-7) - 4(1)] = (-1) [-42 - 4] = 46

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