All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Just Math
The Last Two Digits (Posted on 2013-09-04) Difficulty: 2 of 5
What are the last two digits of (1+5^(2n+1))/6?
Note that n is assumed to be any positive integer.

No Solution Yet Submitted by Danish Ahmed Khan    
Rating: 4.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: answer - spoiler Comment 3 of 3 |
(In reply to answer - spoiler by Ady TZIDON)

All powers of 5 greater than 25 end in 125 or 625. The odd powers of 5 end in 125, and the even powers of 5 end in 625.

  Posted by Math Man on 2013-09-28 21:52:11
Please log in:
Remember me:
Sign up! | Forgot password

Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (4)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Copyright © 2002 - 2018 by Animus Pactum Consulting. All rights reserved. Privacy Information