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) The magnitude of (a+c) equals the magnitude of (b+d),(c ) The magnitude of a can never be greater than the sum of the magnitudes of b ,c and d, (d) b+c mustlie in the plane of and d if a and d are not collinear , and in the line of a and d , if they are collimear ?

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

1.	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) The magnitude of (a+c) equals the magnitude of (b+d),(c ) The magnitude of a can never be greater than the sum of the magnitudes of b ,c and d, (d) b+c mustlie in the plane of and d if a and d are not collinear , and in the line of a and d , if they are collimear ?
Answer» ANSWER :All STATEMENTS EXCEPT (a) - are CORRECT