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Which of the following matrice is invert...

Which of the following matrice is invertible?
`[[1,0,0],[1,1,1],[2,-1,1]]`

Text Solution

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Let A=`[[1,0,0],[1,1,1],[2,-1,1]]`
`therefore absA= [[1,0,0],[1,1,1],[2,-1,1]]`
=`1[[1,1],[-1,1]]=1+1=2 ne 0`
`therefore` A is invertible.
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