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All the points in the set S = ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ ∈ α α + α R : i – i (i = 1 – ) lie on a :

1. circle whose radius is 1.
2. straight line whose slope is 1.
3. straight line whose slope is –1.
4. circle whose radius is 2 .

Correct answer: circle whose radius is 1.

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