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Covert Quantity (Posted on 2013-04-02) Difficulty: 3 of 5
+---------+-------+
| 8 9 5 1 | R R   |       
+---------+-------+       
| 2 1 6 9 | R B   |     
+---------+-------+        
| 3 6 9 4 | R B   |        
+---------+-------+     
| 4 7 2 1 | R B   |        
+---------+-------+ 
| 1 2 3 7 | R R R |        
+---------+-------+
Each of the rows in the table given above indicates an attempt to find out the secret number. Each try has, in the column to the right, the letters R and B.

Each R indicates that this number has one digit in common with the secret number, but in a different position.

Each B indicates that this number has one digit in common with the secret number in the same position.

Determine the secret number.

  Submitted by K Sengupta    
Rating: 3.0000 (1 votes)
Solution: (Hide)
The required secret number is 3719.

For an explanation, refer to Paul and Salil's respective methodology in the comments.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionSolution with proofPaul2013-04-03 19:44:04
SolutionSalil2013-04-03 03:32:03
Solutioncomputer solutionCharlie2013-04-02 16:01:17
SolutionspoilerAdy TZIDON2013-04-02 15:49:05
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