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Question
If the sum A+B of two vectors A and B equals the difference AB between them, then
Options:
A .  A is a null vector              
B .  B is a null vector
C .  both A and B are null vectors
D .  neither A not B is a null vector
Answer: Option B
:
B
Given A+B=AB
Which gives B=B. This is possible only if B is a null vector.
Hence the correct choice is (b).

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