1.

Let A (4, 7, 8), B (2, 3, 4) and C (2, 5, 7) be the position vectors of the vertices of a triangle ABC. The length of the internal bisector of the angle at A is

Answer»

`(1)/(8) SQRT(170)`
`(3)/(8) sqrt(170)`
`(5)/(8) sqrt(170)`
`(7)/(8) sqrt(170)`

ANSWER :b


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