Given a+b+c+d = 0 which of the following statement is incorrect

1.	Given a+b+c+d = 0 which of the following statement is incorrect
Answer» a, b, C and d must each be a null vector. The MAGNITUDE of (a+c) equals the magnitude of (b+d) The magnitude of a can NEVER be greater than the sum of the magnitudes of b, c and d. b+c must lie in the plane of a and b is a and d are not COLLINEAR, and in the line of a and d, if they are collinear Answer :A

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