Nerdle #1101 Answer
Friday, January 24, 2025
20−7−7=6
- Structure
- AB-C-D=E
- Type
- Mixed-Length Subtraction
- Result
- 6
How the clues would have read
- Today's equation begins with a two-digit number in the 20s.
- This puzzle uses subtraction only.
- The result is a single-digit even number.
The numbers behind it
- Divisibility: 20 is divisible by 2, 4, 5, and 10, 7 is prime, 7 is prime, and 6 is divisible by 2 and 3
- Digital roots: 20 → 2+0 = 2, 7 → 7, 7 → 7, 6 → 6
- Prime factorization: 20 = 2²×5, 7 = 7, 7 = 7, 6 = 2×3
Why the structure matters
This puzzle's shape is AB-C-D=E — a mixed-length subtraction, where each letter stands for one digit. Recognising the shape before the arithmetic is what separates a three-guess solve from a six-guess struggle: once you know the equation is a mixed-length subtraction, most of the search space is gone before you have spent a single guess.
The result, 6, factors as 2×3 — those factors are exactly the operations that could have produced it.
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