How Many 4-Digit Numbers? No Repetition! | Example 10
Автор: Milap Integration
Загружено: 2026-01-08
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Описание:
🔐 Lock in the concept! Example 10: Forming 4-digit numbers from 1 to 9, no repetition.
A fundamental permutation problem solved step-by-step by Milap Integration.
❓ Problem Statement:
How many 4-digit numbers can be formed using digits 1 to 9, without repeating any digit?
✅ Thinking Process:
• We are forming a 4-digit number (places: Th, H, T, U).
• Digits are distinct (1-9), no repetition allowed.
• This is a permutation of 9 distinct objects taken 4 at a time (9P4).
⬅️ Previous Video: Example 9
➡️ Next Video: Example 11 - Numbers Between 100 & 1000
💬 Could we use 0? Why not here? Discuss in comments!
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