Which of the following is not an equivalence relation on I, the set of integers; x, y ∈ I….

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Which of the following is not an equivalence relation on I, the set of integers; x, y ∈ I?

Options :-

1. x R y iff x + y is an even integer
2. x R y iff x < y
3. x R y iff x - y is an even integer
4. x R y iff x = y

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