Question

$3$ has a predecessor and a successor. What about $2$ ?

Answer 1

Predecessor : The predecessor of a natural number is one less than the given number.

Successor : The successor of a natural number is the number obtained by adding $1$ to it.

As the predecessor of $3$ is $2$ and the successor of $3$ is $4$. ($\because 3-1=2\mathrm{and}3+1=4$)

Similarly, the predecessor of $2$ is $1$. ($\because 2-1=2$)

And the successor of $2$ is $3$. ($\because 2+1=3$)

Hence, the predecessor of $2$ is $1$ and the successor of $2$ is $3$.