Answer
See work.
Work Step by Step
It is not possible. For 2 vectors to sum to zero, they must have the same magnitude, and be oppositely directed.
For three vectors to sum to zero, they must form a triangle when added together, or form a straight line (which can be considered as a degenerate triangle). By the triangle inequality theorem, the length of any one vector must be less than or equal to the sum of the lengths of the other two vectors.
