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प्रश्न
Check whether the following matrix is invertible or not:
`((1,1),(1,1))`
उत्तर
Let A = `((1,1),(1,1))`
Then, |A| = `|(1,1),(1,1)| = 1 - 1 = 0`
∴ A is a singular matrix.
Hence, A-1 does not exist.
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