Five marks example problems I — task. Mathematics State Board, Class 10.

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$X = \{-5, 1, 3, 4\}$ and

$Y = \{a, b, c\}$ , then which of the following relations are functions from

$X$ to

$Y$ ?

(i)

$\mathbb{R}_1 = \{(-5, a), (1, a), (3, b)\}$

(ii)

$\mathbb{R}_2 = \{(-5, b), (1, b), (3, a), (4, c)\}$

(iii)

$\mathbb{R}_3 = \{(-5, a), (1, a), (3, b), (4, c), (1, b)\}$

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10. Five marks example problems I