Let A=[\table 1 , 2 ; 3 , 4] and B=[\table a , 0 ; 0 , b] a, b \in N . Then,

Correct Answer is : there exists infinitely many B′s, such that AB=BA

there cannot exist any B, such that {AB}= {BA}

there exists more than one but finite number of {B}^{'} {s}, such that {AB}= {BA}

there exists exactly one {B}, such that A B=B A

there exists infinitely many {B}^{'} {s}, such that A B=B A

Army Group X Practice Set 2

Question : 55 of 70

Marks: +1, -0

Let A=[

1	2
3	4

] and B=[

a	0
0	b

] a,b∈N. Then,

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