If x varies as y, then which of the following is/are correct

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If x varies as y, then which of the following is/are correct?

1. x² + y² varies as x² – y²

2. varies inversely as y

3. varies as

Select the correct answer using the code given below:

[CDS II 2020 Mathematics Past paper]

1 and 2 only

2 and 3 only

3 only

1, 2 and 3