Find Missing Numbers: Before and After 81000 in Sequence

To solve this problem, we'll follow these steps:

• Step 1: Calculate the predecessor of 81,000.
• Step 2: Calculate the successor of 81,000.

Now, let's work through each step:
Step 1: The predecessor of 81,000 is obtained by subtracting 1 from it:
$81,000 - 1 = 80,999$.
Therefore, the predecessor is $80,999$.

Step 2: The successor of 81,000 is obtained by adding 1 to it:
$81,000 + 1 = 81,001$.
Therefore, the successor is $81,001$.

Therefore, the solution to the problem is that the numbers are $80,999$ and $81,001$.

The correct choice from the options provided that matches this result is:

Choice 3: $80,999, 81,001$