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If A =           ! 9 ! 8 ! 7 ! 8 ! 7 ! 6 ! 7 ! 6 ! 5 ! 7 ! 6 ! 5 1 , then | adj(adj(2A)) | is equal to -

1. 2 20
2. 2 8
3. 2 12
4. 2 16

Correct answer: 2 16

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