🏋️ Practice Exercises
1
EasyIn how many ways can the letters of the word "MATH" be arranged?
💡 All distinct letters, all positions used → n!
2
MediumHow many ways can a committee of 3 be chosen from 7 people?
💡 Order doesn't matter → use nCr.
3
HardHow many 4-digit numbers can be formed using digits 1–9 without repetition?
💡 Order matters → use nPr.