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Logic problems. The solution to these problems does not usually require a lot of math, but will take some thinking until you find the right approach.
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> Liars and Knights> Weights and Scales
+-----------+---------+
| 1 4 6 7 3 | R R R B |
+-----------+---------+
| 0 2 6 3 7 |  B B B  |
+-----------+---------+
| 6 9 3 0 8 |    R    |
+-----------+---------+
| 5 6 0 7 3 |   R R   |
+-----------+---------+
| 5 9 4 1 8 |   R B   |
+-----------+---------+
Each of the rows of the table given above indicates an attempt to find out the secret number.

• Each key has, in the column to the right has the letters R and B.
• Each R indicates that this digit has one digit common with the secret number, but in a different position.
• Each B indicates that the number has one digit common with the secret number in the same position.

Determine the secret number, given that the 3-digit number constituted by concatenating the last three digits (reading left to right) is a prime number.

(No Solution Yet, 2 Comments) Submitted on 2022-11-22 by K Sengupta   
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