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Let A = ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ 2 0 1 – 2 . If B = I – 5 C 1 (adjA) + 5 C 2 (adjA) 2 –…. – 5 C 5 (adjA) 5 , then the sum of all elements of the matrix B is

1. –5
2. –6
3. –7
4. –8

Correct answer: –7

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