Find the Predecessor: Determining the Number Before 2100

To solve this problem, we'll find the predecessor of 2100 by performing a simple calculation.

Let's outline the steps:

• Step 1: Identify the given number: $n = 2100$.
• Step 2: Apply the formula for a predecessor: subtract 1 from the given number.

Now, let's perform the calculation:

$2100 - 1 = 2099$

Therefore, the predecessor of 2100 is $2099$.