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    				| 1. | 
                                    Let bara= 2bari+3barj+k,barb = 4bari+barj and bari = bari - 3barj-bark. " Find vector " barr " such that " barr.bara = 9, barr .barb = 7 and barr .barc =6. | 
                            
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Answer»  `bari+3barj+2bark`  | 
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