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Find |adj(A)| if |A|= 7 and A is a squar...

Find `|adj(A)|` if |A|= 7 and A is a square matrix of order 3

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The correct Answer is:
`(A) rarr (r,t); (B) rarr (s); (C) rarr (p); (D) rarr (q)`
`(A) rarr (r,t), (B) rarr (s), (C) rarr (p), (D) rarr (q)`
(A) `adj (A^(-1)) = (A^(-1))^(-1) det (A^(-1)) = A/(det(A))`
`("adj"" adj"A)/((adj A)^(n-1) )=(A[det(A)]^(n-2))/((detA)^(n-1) )=A / (det(A))`
(B) `det(adj A^(-1))= (det A^(-1))^(n-1)`
`= 1/((det A)^(n-1))=(detA)^(1-n)`
(C) `"adj" ["adj "A] = A (det A) ^(n-2)`
`"adj" (A det A) = (detA)^(n-1) ("adj 0"A)`
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