Ranking from 3 groups (a grading system for our club)

TableTennisGuru

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Feb 1, 2017
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We're have trouble trying to get a grading system for our club.

We have 18 players, broken into 3 groups (1-6, 7-12 & 13-18). What is the best way to take one from each group to ensure that we get 6 groups of 3 as close as possible?
Many Thanks.
 
We're have trouble trying to get a grading system for our club.

We have 18 players, broken into 3 groups (1-6, 7-12 & 13-18). What is the best way to take one from each group to ensure that we get 6 groups of 3 as close as possible?
Many Thanks.
Can you explain what you mean by "as close as possible" - close to what as possible?
 
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