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Q.

Let A  and  B are square matrices of order 2 with real elements such that  AB=A2B2(AB)2 and  det(B)=2.  Then which of the following is/are true :

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a

det(A+B+C)=det(A+B)+det(B+C)+det(C+A)det(A)det(B)det(C)

b

det(A+2B)det(B+2A)=6

c

tr(ABBA)=0

d

Matrix  A is not invertible

answer is A, B, C, D.

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Detailed Solution

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 AB=A2B2(AB)2 AB+(AB)2=A2B2 (AB)(I+AB)=A2B2(A)=0 AB=A2B2(AB)2 A=A2BABA A(IAB+BA)=0
A=0 (or) I=ABBA  (Not possible)
B)  det(A+2B)det(B+2A)
=det(2B)det(B) =4(2)2=6
C)  tr(ABBA)=tr(0)=0
D)  Det(A+B+C)=Det(B+C)
 

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