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Let bar a = 2bar i- bar j+bar k,bar b =b...

Let `bar a = 2bar i- bar j+bar k,bar b =bar i+2bar j-bar k and bar c=bar i+bar j-2bar k` be three vectors. A vector in the plane of `bar b and bar c` whose projection on `bar a ` is of magnitude `sqrt(2/3)` is

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