Find, if possible, AB and BA.A = 
, B = 
A. AB = 
, BA not defined
B. AB not defined, BA = 
C. AB = 
, BA not defined
D. AB not defined, BA = 
Answer: D
Mathematics
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?
?
, 
, 
?
A. 
B. ?
C. ?
D. ?
E. ?
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