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 magitude 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 if a and d are not COLLINEAR, and in the line of a and d, if they are collinear Answer :A

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