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    				| 1. | 
                                    It is found that\vert \xrightarrow[A]{}+\xrightarrow[B]{}\vert = \vert\xrightarrow[A]{}\vert. This necessarily implies(a) \xrightarrow[B]{} =0(b) \xrightarrow[A]{}, \xrightarrow[B]{} are antiparallel(c) \xrightarrow[A]{}, \xrightarrow[{}]{} are perpendicular(d) \xrightarrow[A]{} .\underset B{→≤0 | 
                            
| Answer» It is found that\vert \xrightarrow[A]{}+\xrightarrow[B]{}\vert = \vert\xrightarrow[A]{}\vert. This necessarily implies(a) \xrightarrow[B]{} =0(b) \xrightarrow[A]{}, \xrightarrow[B]{} are antiparallel(c) \xrightarrow[A]{}, \xrightarrow[{}]{} are perpendicular(d) \xrightarrow[A]{} .\underset B{→≤0 | |