Given a+b+c+d=0 which of the following statements are correct. (a) a,b,c and d

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Given a+b+c+d=0 which of the following statements are correct. (a) a,b,c and d must each be null vector. (b) magnitude of a+c equals to magnitude of b+d. (c) the magnitude of a can never be greater than the sum of magnitude of b,c and d. (d) b+c must lie in the plane of a and d if a and d are not collinear, and in the line of A and B if they are collinear.

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