Question 1177692
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The problem is either trivial or not stated clearly.<br>
There is only one way to separate the 15 students to get all the boys in one group and all the girls in the other.<br>
Perhaps there is more than one group of all boys and/or more than one of all girls?<br>
Perhaps the undefined "worktable" has something to do with working the problem?<br>
Re-post, giving enough information so that it is clear what the question is.<br>