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Missing digit (Posted on 2012-11-03) Difficulty: 3 of 5
Alice: Pick a 5-digit number.
Bob: Got it.
Alice: Now reverse it and subtract the lesser from the greater.
Bob: Done.
Alice: Now pick one of the five digits of the result and circle it (but don't choose a zero). Tell me the other digits, in some random order.
Bob: Sure; they are 1, 1, 0, and 8.
Alice: Then the circled digit is....

Alice does indeed correctly give the circled digit. How did she do it?

No Solution Yet Submitted by Danish Ahmed Khan    
Rating: 2.3333 (3 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
A link | Comment 2 of 3 |
This link still works after all these years:

http://www.digicc.com/fido/

It's pretty much the same puzzle in interactive form. 

Thanks Danish for adding it to our little repository.

  Posted by Jer on 2012-11-03 22:20:22
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