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Question
Let,
A=461302125, B=240112
and C=[123]
The expression which is not defined is: 
Options:
A .  B′B
B .  CAB
C .  A+B′
D .  A2+A
Answer: Option C
:
C
We can see from the options that if we take transpose of B,
B will be of 2 x 3 matrix which cannot be added to a 3 x 3 matrix, as for the addition the order should be the same.

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