Find the Predecessor and Successor: Numbers Adjacent to 2000

To solve this problem, we first need to determine the predecessor of 2000. The predecessor is found by subtracting 1 from the number:

• Predecessor: $2000 - 1 = 1999$

Next, we find the successor of 2000. The successor is calculated by adding 1 to the number:

• Successor: $2000 + 1 = 2001$

Thus, the predecessor of 2000 is 1999, and the successor is 2001.

Therefore, the sequence with the number 2000 and its consecutive neighbors is given by:

$1999,2000,2001$

Comparing this with the provided choices, we can confirm that the correct choice is : $1999,2001$.