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CBSE Class 12 Math 2019 Delhi Set 1 Solved Paper

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Question : 24 of 29
Marks: +1, -0
x+y+z=6,x+2z=7,3x+y+z=12
OR
Find the inverse of the following matrix using elementary operations.
A=[
12−2
−130
0−21
]
Solution:  
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