dse 2011 question 3

[football fan]

could someone please tell me why the answer to Q-3 is 2, not 1.

[econ14]

if there is only one non zero scalar then sum i=1 to n civi will not be 0 there must be at least 2 non zero scalar ....... so minimum will be 2......... u can check by using an example.

[football fan]

thanks :)