Every whole number has its successor.
Idea: A successor means the next number.
Whole numbers are:
\(0,\;1,\;2,\;3,\;\dots\)
Pick any whole number and call it \(n\).
To find its successor, add \(1\):
\(n + 1\)
\(n + 1\) is also a whole number (because adding 1 to a whole number stays in whole numbers).
Examples
\(0 \to 1\)
\(5 \to 6\)
\(23 \to 24\)
There is no “last” whole number, so this works for every \(n\).
Conclusion: Every whole number has a successor. Hence, the statement is true.