Values of a for which the points A, B, C...

Values of a for which the points A, B, C with position vectors 2i - j+k, i - 3j - 5k and ai - 3j +k, respectively, are the vertices of a right angled triangle with `C = (pi)/2` are

`-2,-1`

`-2,1`

`2,-1`

`2,1`

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