Q 2329167911.     What is the value of `n`, so that the angle between
the lines having direction ratios `(1, 1, 1)` and
`( 1, -1, n)` is `60^(circ)`?

NDA 2009 Paper 1 September
A

`sqrt(3)`

B

`sqrt(6)`

C

`3`

D

None of these

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