## Thinking Mathematically (6th Edition)

The digit symbol for base 9 is 0 to 8. P is preceding numberof ${{888}_{nine}}$. \begin{align} & P={{888}_{nine}}-1 \\ & ={{887}_{nine}} \end{align} F is following numberof ${{888}_{nine}}$. The digit symbol for base 9 is 0 to 8. $F={{888}_{nine}}+1$ In base nine, ${{8}_{\operatorname{nine}}}+1={{10}_{nine}}$ $F={{1000}_{nine}}$