1.

a, b, c are three mutually perpendicular unit vectors inthe right handed system. If the points P, Q, R with position vectors 2a+5b-4c, a+4b-3c " and "ka+7b-6c respectively lie on a line, then the ratio in which the point P divides QR is

Answer»

`1:2`
`-1:3`
`3:1`
`-1:2`

ANSWER :A


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