Question
State that the given relation is a function? Give reason. If it is a function, determine its domain and range. {(2, 1), (5, 1), (8, 1), (11, 1), (14, 1), (17, 1)}
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| (a) $\{P, R, I, N, C, A, L\}$ | (i) $\{x : x$ is a positive integer and is a divisor of $18\}$ |
| (b) $\{0\}$ | (ii) $\{x : x$ is an integer and $x^2 – 9 = 0\}$ |
| (c) $\{1, 2, 3, 6, 9, 18\}$ | (iii) $\{x : x$ is an integer and $x + 1 = 1\}$ |
| (d) $\{3, –3\}$ | (iv) $\{x : x$ is a letter of the word PRINCIPAL$\}$ |