The difference of successor of $999$ and predecessor of $999$ is

1. $4$

2. $0$

3. $2$

4. $1$

The correct option is C

$2$

To find difference of Successor and predecessor

First let us find the successor of $999=1000$

Next the predecessor of $999=998$

$\therefore$Difference $=$ Successor $+$ predecessor

$$\begin{gathered} =1000-998 \\ =2 \end{gathered}$$

Hence, Difference of Successor and predecessor is $2$