Search found 2 matches
- by Simon Nguyen
Mon May 23, 2016 2:38 am- Forum: Problem Solving
- Topic: There are a lot of houses such that the numbers of their doo
- Replies: 5
- Views: 1944
The unit digits of 3-base powers follow this sequence: 3, 9, 7, 1 Indeed: 3^1 = 3 => unit digit is 3 3^2 = 9 => unit digit is 9 3^3 = 27 => unit digit is 7 3^4 = 81 => unit digit is 1 3^5 = 243 => unit digit is 3 If 3 is raised to 67th power, the unit digit numbers will repeat this sequence until it...
- by Simon Nguyen
Mon May 23, 2016 2:30 am- Forum: Problem Solving
- Topic: What is the units digit of 367?
- Replies: 7
- Views: 3858