Unit and Last Digits
7 lessons · 5 questions · 2 PYQs
What the exams ask here
- unit digit of 743^85 - 525^37 + 987^96 (Indore 2021 Q16)
- unit digit of p^3 is 4 -> unit digit of (p+3)^3 (Indore 2023 Q39)
- last two digits of 3^400, 7^2024
- unit digit of 1! + 2! + ... + 1000!, (1!)^99 + (2!)^98 + ...
- unit digit of 2^(3^4) type towers
Lessons
- Start hereThe idea and the methodFirst lesson of Unit and Last Digits5 min video
- 1.Cyclicity 4New numbers every time (templates)
- 2.Unit Digit of Sums and Products1 questionIndore 20214 min video
- 3.Last two digits2 questions + fresh variants
- 4.Factorial unit digitNotes only
- 5.Reverse the Unit Digit: Cubes1 question + fresh variantsIndore 20234 min video
- 6.Unit Digit of Power Towers1 question4 min video