You can
put this solution on YOUR website! 36 people in groups of 3 how many groups such that no 2 people are in more than 1 group.
If you have 12 groups of 3, then nobody is in more than one group,
so this makes no sense. You'll have to state the problem exactly
word-for-word like it's written in your source, or we won't be
able to help you.
Edwin