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Question

Let a=2^i^j+^k,b=^i+2^j^k and c=^i+^j2^k be three vectors. A vector in the plane of b and c whose projection on a is of magnitude (2/3) is

A
2^i+3^j3^k
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B
2^i+3^j+3^k
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C
2^i^j+5^k
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D
2^i+^j+5^k
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