If {A}=[\table 0 ,-{i} ;{i} ,0 ] and {B}=[\table 1 , 0 ;0 , -1 ] are matrices, then {AB}+{BA} is:

Correct Answer is : a null matrix

UPSC NDA Math Model Paper 4

Question : 65 of 120

Marks: +1, -0

If A=[

0	−i
i	0

] and B=[

1	0
0	−1

] are matrices, then AB+BA is:

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0+0	i+0
0+i	0+0

0+0	−i+0
0−i	0+0

0+0	i−i
i−i	0+0