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Question
Which of the following vectors identities is/are false?(Below mentioned A, B and C are vectors, represented without vector sign on them)
 
Options:
A .  A + B = B + A      
B .  A + B = - (B + A)
C .  (A + B) + C = A + (B + C)
D .  A + (B + C) = (A + C) + B
Answer: Option B
:
B
Vector addition is commutative, i.e. A + B = B + A. Vector addition is also associative,
i.e. (A + B) + C = A + (B + C) = (A + C) + B.
Hence choice (b) is false.

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