Four pairs of lords and ladies all went to a royal ball. Each lord was wearing one color (yellow, red, blue, or green) and each lady was also wearing one of these colors. No couple was wearing the same color, so it was hard to tell who was married to who.

Using the clues, can you determine which lord is with which lady?

1. The Green Lord is with the Red Lady, if and only if the Yellow Lord is with the Blue Lady.

2. The Yellow Lord is with the Red Lady if and only if the Green Lord is with the Yellow Lady

3. The Red Lord is with the Blue Lady, if and only if the Green Lord is with the Red Lady.

The Yellow Lord is with the Red Lady

The Green Lord is with the Yellow Lady

The Red Lord is with the Blue lady

The Blue Lord is with the Green Lady

Clues 1 and 3 cannot both be true, so that gives the first two statements. Then The Blue lord cannot be with the Blue lady, so that lets the other two couples fall into place.

Posted by Kelly on 2004-05-31 19:27:00