Find the Missing Numbers: Complete the Sequence __, 13899, __

To solve this problem, we will find the numbers immediately before and after 13,899:

• Step 1: Calculate the predecessor by subtracting 1 from 13,899.
• Step 2: Calculate the successor by adding 1 to 13,899.

Let's perform these calculations:

Step 1: Predecessor is $13,899 - 1 = 13,898$. Therefore, the number before 13,899 is 13,898.

Step 2: Successor is $13,899 + 1 = 13,900$. Therefore, the number after 13,899 is 13,900.

Thus, the complete sequence is $13,898, 13,899, 13,900$.

The correct answer is choice 1: $13898,13900$