Question: A city traffic control system uses license plates with 3 distinct letters followed by 3 distinct digits. If the letters are chosen from the first 10 letters of the alphabet and digits from 0 to 9, how many unique license plates can be generated?

Sat, 02 May 2026 15:10:52 +0000

**How Cities Manage Identity with License Plates—A Behind-the-Scenes Look at Security and Design** What makes a city’s traffic system more than just moving cars? Behind the scenes, license plates carry a unique code—combining letters and numbers that keep vehicle tracking precise, secure, and easy to recognize. A growing topic of interest is how cities use a system where each plate features three distinct letters from the first 10 letters of the alphabet followed by three distinct digits from 0 to 9. This structured format blends security, readability, and efficiency—elements increasingly relevant as urban centers evolve. Understanding how many unique combinations this system allows reveals not just a math problem, but a sophisticated design challenge faced by modern transit networks. **Why This License Plate System Is Shaping More Conversations**
Urban mobility is under growing scrutiny as cities expand and traffic patterns grow more complex. With rising concerns over identity theft, toll fraud, and license plate tracking, secure, distinct identifiers have become essential. The three-letter, three-digit format—where every character must be unique—serves as a practical solution. It balances simplicity for users and strong protection against spoofing. This blend of accessibility and security has sparked curiosity among tech-savvy residents and city planners alike, especially as digital infrastructure continues to expand in how public services manage data. **How It Works: Counting the Unique License Plates**
The system uses three distinct letters selected from the first 10 letters—A, B, C, D, E, F, G, H, I, J—with no repetition. The number of ways to choose and arrange three distinct letters is calculated using permutations:
10 letters → choose 3 without repetition, order matters →
10 × 9 × 8 = 720 possible letter sequences.