Multiple Choice Questions on Let matrix B be the adjoint of a square matrix A l be the identity matrix of same order as A If k nb........... for NDA Exam Preparation

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Multiple Choice Questions

Let matrix B be the adjoint of a square matrix A l be the identity matrix of same order as A If k nb...........

Mathematics (NDA) Matrices and Determinants
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    Let matrix B be the adjoint of a square matrix A, l be the identity matrix of same order as A. If k( \neq 0) is the determinant of the matrix A, then what is AB equal to?

    l

    Incorrect Answer

    kl

    Correct Answer

    k2l

    Incorrect Answer

    (1/k)l

    Incorrect Answer
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    Explanation:

    B = adj A,l = Identity matrix, |A|=k
    AB=A(adj A)=|A| l=kl

    By: Munesh Kumari
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