Q. 124.9( 33 Votes )

If , and A + A’ = I, if the value of a is
A.

B.

C.

D.

Answer :

Given A =

Therefore, A’ =


Also given that A + A’ = I


(Putting the values in the above equation)





We know when two matrices are equal only when all their corresponding elements or entries are equal i.e. if A = B, then aij = bij for all i and j.


This implies,





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