[rookie1ja]

Master Mind - Back to the Number Puzzles
Find the four-digit number designated by asterisks, given the following:

* All four digits of the unknown number are different.
* None of the digits is zero.
* Each “0” on the right of each four-digit number below indicates that the number has a matching digit in a non-matching position with the unknown number.
* Each “+” on the right of each four-digit number below indicates that the number has a matching digit in a matching position with the unknown number.

6152 +0
4182 00
5314 00
5789 +
-------------
****

Spoiler for Solution:

Master Mind - solution
6741

Spoiler for old wording:

What is the number replaced by asterisks, if:

* symbol 0 represents a guessed number in the line,
* symbol + represents a guessed number in the line, that is on its right place,
* the result has no number 0,
* no numeral is more than once in the result.

6152 +0
4182 00
5314 00
5789 +
-------------
****

[uggelsome]

I actually got that right!

[BabyGurlV]

How did you arrive at that answer?

[odin787]

yeah, how? I'm confused.

[phillip1882]

Spoiler for how answer is gotten

line1: 6152 +0
line2: 4182 00
line3: 5314 00
line4: 5789 +

based on line 4 and line 3, we know 5 cannot be in the answer.
based on line 4 and line 2, we know 8 cannot be in the answer.
based on line 1 and line 2, we know 1 nor 2 is in the correct spot in line 1.
therefore 6 must be the first number.
based on line 2, either 1 or 2 but not both are in the answer, therefore 4 must be in the answer.
based on line 3, 1 must be in the answer.
therefore the only solution is 6741.

This post has been edited by phillip1882: 18 October 2009 - 02:53 AM