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NDA Math Sets Relations and Functions

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Question : 9

Total: 90

Consider the following statements:
1. If f is the subset of Z×Z defined by f={(xy,x−y);x,y∈Z}, then f is a function from Z to Z.
2. If f is the subset of N×N defined by f={(xy,x+y);x,y∈N}, then f is a function from N to N.
Which of the statements given above is/are correct?

1 only
2 only
Both 1 and 2
Neither 1 nor 2

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