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KVPY 2020: Find number of invertible 2x2 matrices with integer entries under given conditions.

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Dr. Mathaholic

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Tue, 20 Apr 2021 00:00:00 GMT
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This question was asked in KVPY exam in the year 2020. This is a problem involving 2x2 matrices and its inverse. The restriction on inverse is that entries have to be integer entries. We will see how adjoint and determinant relation will help us to find the inverse of this matrix. I hope the solution will help you.

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