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 Covert Quantity (Posted on 2013-04-02)
```+---------+-------+
| 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.

 Subject Author Date Solution with proof Paul 2013-04-03 19:44:04 Solution Salil 2013-04-03 03:32:03 computer solution Charlie 2013-04-02 16:01:17 spoiler Ady TZIDON 2013-04-02 15:49:05

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