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If P is a 3 × 3 real matrix such that P T = aP + (a – 1) I, whe re a > 1, then

1. 2 1 | P Adj | 
2. 1 | P Adj | 
3. P is a singular matrix
4. 1 | P Adj | 

Correct answer: 1 | P Adj | 

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