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CBSE Class 12 Math 2008 Solved Paper

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Question : 5
Total: 29
Find the co-factor of a12 in the following:
|
2−35
604
15−7
|
Solution:  
|
2−35
604
15−7
|
Cofactor of a12 = (−1)1+2 [6(-7) - 4(1)] = (-1) [-42 - 4] = 46
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