It refers to given elements a and b, the symbol (a,b) denotes the ordered pair consisting of a and b noting that a is the first element of the pair b is the second element .Any two ordered pairs (a,b) and (c,d) are said to be equal if and only if, a=c and b=d.
- Set- Roster Notation
- Set-Builder Notation
- Ordered Pair Correct
- Subset