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The vertices of a Delta ABC are A (2, 3,...

The vertices of a `Delta ABC` are `A (2, 3, 1), B (-2, 2, 0) and C(0, 1, -1)`.
What is the cosine of angle ABC?

A

`1/sqrt3`

B

`1/sqrt2`

C

`2/sqrt6`

D

None of these

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The correct Answer is:
D
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