Question: How many distinct 7-character codes can be formed using the letters A, B, C, D, E, F, G if exactly two adjacent characters are the same and the rest are distinct?

Sun, 03 May 2026 01:30:04 +0000

How Many Distinct 7-Code Combinations Include Exactly One Pair of Adjacent Matching Letters?
*(Optimized for US Discover, high dwell time)* Trying to understand how unique 7-character codes using just A through G—with exactly one pair of adjacent matching letters—can be assembled? This puzzle blends combinatorics with pattern-driven design, reflecting a growing interest in structured codes, identity verification, and secure digital identity systems. As businesses, developers, and consumers navigate risks around digital identity and data integrity, questions about controlled complexity and variability in code design are emerging more frequently. This specific question taps into both practical coding challenges and broader trends in information security and design efficiency. --- ### Why Is This Question Gaining Traction in the US?