For the relation $R = \{(1,2), (2,3), (3,4), (4,5), (5,6)\}$ on $\{1,2,3,4,5,6\}$, what is the **domain**?
A$\{2, 3, 4, 5, 6\}$
B$\{1, 2, 3, 4, 5\}$
C$\{1, 2, 3, 4, 5, 6\}$
D$\{6\}$
Answer & Solution
Correct answer: B. $\{1, 2, 3, 4, 5\}$
Domain = set of first elements of the pairs = $\{1, 2, 3, 4, 5\}$. (B is the *range*; C is the *codomain*.)
Related questions
Direct: The mother said, 'Sleep now, my child.' Indirect form isDirect: She said to him, 'Can you help me?' Indirect form isDirect: She said, 'May God bless you!' Indirect form isDirect: The boy said, 'Alas! I have failed.' Indirect form isDirect: He said, 'I bought this book yesterday.' Indirect form isDirect: He said, 'I will see you tomorrow.' Indirect form isDirect: She said, 'Hurrah! We have won the match.' Indirect form isDirect: He said to her, 'Please help me.' Indirect form is