1.

If the direction ratios of the lines L_(1)andL_(2) are 2, -1, 1 and 3, -3, 4 respectively, then the direction cosines of a line that is perpendicular to both L_(1)andL_(2) are

Answer»

`pm2/sqrt6,pm1/sqrt6,pm1/sqrt6`
`pm1/sqrt35,pm5/sqrt35,pm3/sqrt35`
`pm3/sqrt34,pm3/sqrt34,pm4/sqrt34`
`pm1/sqrt14,pm2/sqrt14,pm3/sqrt14`

ANSWER :B


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