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Let A=         q p n m , d = |A|  0 and | A − d ( Adj A ) | = 0 . Then

1. (1 + d) 2 = m 2 + q 2
2. (1 + d) 2 = (m + q) 2
3. 1 + d 2 = ( m + q ) 2
4. 1 + d 2 = m 2 + q 2

Correct answer: (1 + d) 2 = (m + q) 2

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