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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.

See The Solution Submitted by K Sengupta    
Rating: 3.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution | Comment 3 of 4 |
Since  1,2,3 is not a possibility the option of digits is only 1,3,7,9 and based on deduction a) 1 cannot be on 4th position based on 1st number so 7 is on second based 4th number b) since 1 is neither on 4th or 1st postion based on 1st & 5th number and 7 is on second so 1 is on third c) So 9 cannot be on third so 3 in on first based on 3rd number. So only choice for 9 is fourth which matches with result for 2nd number. Hence Number is 3719.   
  Posted by Salil on 2013-04-03 03:32:03
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