Question

1 Any bunch of numbers is a _____ ,so long as the numbers come in pairs.
group
domain
axiom
relation

2 A ___ is just a set of ordered pairs.
sets
functions
partition
relation

3 Let N ={1,2,3,4,5, €¦ €¦ €¦.}, E = {2,4,6, €¦ €¦.}, F = {1,3,5, €¦ €¦..}. Then, {E,F} is a _____ of N.
functions
partition
relation
sets

4 A relation is a _____ ordering,if it is reflexive,anti- symmetric and transitive.
partial
complex
group
equal

5 A relation is a set of an ______ relation,if it is reflexive,transitive and symmetric.
simple
equal
balance
equivalence