What is the value of n, so that the angle between the lines having direction ratios (1, 1, 1) and ( 1, -1, n) is

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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
A

sqrt(3)

B

sqrt(6)

C

3

D

None of these

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