How many patterns can you make with 2 digits, followed by a letter,followed by a digit, if your pattern cannot start with 0?

Sure, let's break it down:

1. The first digit: Since the pattern cannot start with 0, we have 9 choices (1-9) for the first digit.

2. The second digit: This can be any digit from 0-9, so we have 10 choices.

3. The letter: Assuming we're using the English alphabet, we have 26 choices (A-Z).

4. The final digit: This can be any digit from 0-9, so we have 10 choices.

To find the total number of patterns, we multiply the number of choices for each part of the pattern together:

9 (first digit) * 10 (second digit) * 26 (letter) * 10 (final digit) = 23,400 patterns.