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प्रश्न
Which of the following matrix has no inverse
विकल्प
`((-1,1),(1,-4))`
`((2,-1),(-4,2))`
`((cos a, sin a),(-sin a, cos a))`
`((sin a, sin a),(-cos a, cos a))`
उत्तर
`((2,-1),(-4,2))`
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