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Three vectors  and  are given as

Which of the following is/are CORRECT?

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Explanation:

(a) 

(This is always true for any three given vectors)

(b) We know that  is always true but  because 

This can be true only when 

So, 

This can be true if

 this is true in this case

(c)  can't be equal to  because  and 

So, 

(d) 

0 = 0

(Hence this is proved) 

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