Relation or not a relation — task. Mathematics State Board, Class 10.

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Let

$A =$

$\{$ 10, 15, 14, 11

$\}$ and

$B =$

$\{$ 9, 8, 7

$\}$ . Which of the following sets are relations from

$A$ to

$B$ ?

$R_1 =$

${(10, 9), (15, 5), (7, 10), (14, 11)}$

ii)

$R_2 =$

${(7, 12), (15, 8)}$

iii)

$R_3 =$

${(10, 9), (15, 8), (10, 7), (14, 8), (15, 9), (11, 8), (14, 9)}$

$1$

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5. Relation or not a relation