The projections of a vector on the three coordinate axis are $6,-3,2$ respectively. The direction cosines of the vector are :

Question

${6 \over 5},{{ - 3} \over 5},{2 \over 5}$

${6 \over 7 },{{ - 3} \over 7},{2 \over 7}$

${- 6 \over 7 },{{ - 3} \over 7},{2 \over 7}$

$6, -3, 2$

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