#### Question

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

(a) 2

(b) -2

(c) 10

(d) -10

#### Solution

**Ans. (B)**

A( Adj A) =|A| . I

`therefore K=|A|`

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

Is there an error in this question or solution?

#### APPEARS IN

Solution A=[[1,2],[3,4]] ans A(Adj A)=KI, then the value of 'K' is Concept: Determinants - Adjoint Method.