If A is a matrix of order 3 and |A| = 3 , then the value of |adj A| is
Answer & explanation
Correct answer: option 1
We know that |adj A| = \( { |A| }^{ n-1 } \) , where n is the order of matrix A.
So, |adj A| = \( { |A| }^{ 3-1 } \) = \( { |A| }^{ 2 } \) = \( { 3 }^{ 2 } \) = 9