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Let S =  M = [a ij ], a ij  0, 1, 2  ,  1  i, j  2  be a sample space and A  M  S :M is invertible  be an even. Then P(A) is equal to

1. 27 16
2. 81 47
3. 81 49
4. 81 50

Correct answer: 81 50

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