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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)

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Solution the digit Comment 9 of 9 |
0


  Posted by Math Man on 2012-09-27 20:12:23
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