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If direction cosines of a vector of magn...

If direction cosines of a vector of magnitude 3 are `(2)/(3), -(a)/(3), (2)/(3) and a gt 0`, then vector is ________

A

`i+2j+ 2k`

B

`i-2j+2k`

C

`2i-j+2k`

D

`2i+j+2k`

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