Let `A(0, 1, 1), B(3, 1, 5)` and `C(0, 3, 3)` be the vertices of a `triangle ABC`. Using vectors,

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Let `A(0, 1, 1), B(3, 1, 5)` and `C(0, 3, 3)` be the vertices of a `triangle ABC`. Using vectors, show that `triangle ABC` is right angled at C.
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