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

Home > Numbers
Erasing digits (Posted on 2002-04-27) Difficulty: 3 of 5
Digits from 1 to 9 are written on the board.

A student erases a few of them, and instead writes the digit(s) of their product. (For example if he erases 4, 3 and 7 he would write the digits 8 and 4 since 4 * 3 * 7 = 84.) He also writes a few other random digits on the board.

He repeats this process until only one digit remains on the board. What is this digit and why?

See The Solution Submitted by levik    
Rating: 2.9091 (11 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Solutionthe digitMath Man2012-09-27 20:12:23
SolutionSolutionLisa2005-05-10 15:19:48
well,Jonathan Waltz2003-03-31 08:55:08
answerErin2003-01-14 09:14:01
re: i have to disagreecges2002-12-11 06:24:21
re: i have to disagreefriedlinguini2002-12-10 06:14:10
i have to disagreeCory Taylor2002-12-10 04:28:11
SolutionSolutioncges2002-12-09 06:00:01
My AnswerTom2002-05-09 12:52:41
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 (2)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Copyright © 2002 - 2019 by Animus Pactum Consulting. All rights reserved. Privacy Information