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Let bara= 2bari+3barj+k,barb = 4bari+bar...

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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The correct Answer is:
` bara=bari+3barj-2bark`.
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