If A=aij is a scalar matrix of order n x n such that aij=k for all i=j, then trace of A is 

If A=aij is a scalar matrix of order n x n such that aij=k for all i=j, then trace of A is 

  1. A

    k

  2. B

    nk

  3. C

    n

  4. D

    none of these

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    Solution:

    trace of A= sum of the principal diagonal elements =k+k+...+k=nk

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