by head to tail rule they are added
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Two vectors: no. Three vectors: yes.
Two or more vectors combine to form a resultant sum; V1 + V2 + ...+ Vn = VR
-- The minimum magnitude that can result from the combination of two vectors is the difference between their magnitudes. If their magnitudes are different, then they can't combine to produce zero. -- But three or more vectors with different magnitudes can combine to produce a zero magnitude.
No.
Yes, if they are pointing in opposite directions (separated by 180°).