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The vertices of a triangle ABC are A(-1,...

The vertices of a triangle ABC are `A(-1,2,-3),B(5,0,-6),C(0,4,-1)`. Then the direction rations of the external bisector of `/_ C` are :

A

0,0,1

B

1,-1,1

C

`-1,0,0`

D

none

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The correct Answer is:
C
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