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neves dda tsuj (Posted on 2004-02-22) Difficulty: 3 of 5
You have a simple (base-ten, whole number) calculator which can perform only two operations: visually reversing a number, and adding seven.

Prove that you can use this calcluator to convert any number to 1.

Notation: use ~ to denote reversal, as in
~53 = 35

No Solution Yet Submitted by DJ    
Rating: 4.5000 (6 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Straightforward , but not so | Comment 10 of 11 |
(In reply to re: Straightforward , but not so "executable" Solution by Ady TZIDON)

Do you have to be so practical-minded? The problem statement only asks: "Prove that you can use this calcluator to convert any number to 1. " I really don't care about the wear and tear on the operator's finger -- the operator here is as imaginary as the calculator!
  Posted by Richard on 2004-02-24 11:44:04

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