138. If AB = A and BA = B then |A | + |B] = [ ]
1) 2 2) 3 3) 0 4) 1
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Answer:
3) 0
Step-by-step explanation:
AB=A BA=B
AB/BA=A/B
A/B=0
A=0. B=0
A+B= 0+0
=0
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