Easy, the fourth vector (D) be opposite the sum of the other three non-coplanar vectors (A , B, C).
0=A + B + C + D where D = -(A + B + C).
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Assuming you want non-zero vectors, two opposing vectors will give a resultant of zero.
Yes.
Two vectors: no. Three vectors: yes.
No.
Two vectors, no; three vectors yes.