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UPSC NDA I 2014 Mathematics Paper

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Question : 2

Total: 120

Consider the following relations from A to B where A = {u, v, w, x, y, z} and B = {p, q, r, s}.
1. {(u, p), (v, p), (w, p), (x, q), (y, q), (z, q)}
2. {(u, p), (v, q), (w, r), (z, s)}
3. {(u, s), (v, r), (w, q), (u, p), (v, q), (z, q)}
4.{(u, q), (v, p), (w, s), (x, r), (y, q), (z, s)}
Which of the above relations are not functions?

1 and 2
1 and 4
2 and 3
3 and 4

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