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Three coplaner vectors in arbitrary units are given by A-> =4i^ +2j- 3k^ ,B-> = i+ j+ 3kand C-> = 4i^ +5j^ +3k^ , the resultant is 

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resultant vector =A-> +B->+ C->=(4i^ +2j^- 3k^)+(i^+j^+3k^)+(4i^ +5j^+3k^)

                                                  =9i^+8j^+3k^

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