Q.

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

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a

k

b

nk

c

n

d

none of these

answer is B.

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Detailed Solution

trace of A= sum of the principal diagonal elements =k+k+...+k=nk
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Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
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Best Books for NEET
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