HSC Arts 12th Board ExamMaharashtra State Board
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A=[[1,2],[3,4]] ans A(Adj A)=KI, then the value of 'K' is - HSC Arts 12th Board Exam - Mathematics and Statistics

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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

 2013-2014 (March) (with solutions)
Question 1.1.2 | 2.00 marks

Video TutorialsVIEW ALL [1]

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