Explanation
Cross product of two vectors is perpendicular to the plane containing both the vectors.
For giving a zero resultant, it should be possible to represent the given vectors along the sides of a closed polygon and minimum number of sides of polygon is three.
If two vectors equal in magnitude are in opposite direction, then their sum will be a null vector.
A null vector has direction which is intermediate (or depends on direction of initial vectors) even its magnitude is zero.
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