Question

`A=[[1,2],[3,4]]` ans A(Adj A)=KI, then the value of 'K' is

Options

• 2

• - 2

• 10

• -10

Answer 1

A( Adj A) =|A| . I

`therefore K=|A|`

`therefore |A|=|[1,2],[3,4]|=-2`