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Let A be a 2 × 2 matrix with real entries such that A'=  A+1, where   R − {−1, 1}. If det ( A 2 – A) = 4, the sum of all possible values of  is equal to :

1. 0
2. 2 3
3. 2
4. 2 5

Correct answer: 2 5

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