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 Erasing digits (Posted on 2002-04-27)
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)

 Subject Author Date the digit Math Man 2012-09-27 20:12:23 Solution Lisa 2005-05-10 15:19:48 well, Jonathan Waltz 2003-03-31 08:55:08 answer Erin 2003-01-14 09:14:01 re: i have to disagree cges 2002-12-11 06:24:21 re: i have to disagree friedlinguini 2002-12-10 06:14:10 i have to disagree Cory Taylor 2002-12-10 04:28:11 Solution cges 2002-12-09 06:00:01 My Answer Tom 2002-05-09 12:52:41

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