Answer:

The reason behind the prohibition against free mixing between men and women is due to fear of falling into fitnah, lest it becomes a means to committing lewd acts; (a means) to violating the honour of women and corrupting the society. And indeed these affairs can become a greater reality through free mixing in education. Therefore, it (i.e. free mixing in education) is forbidden. [Fataawaa Al-Lajnah Ad-Daa’imah 12/169]

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Abu Mu’aawiyah (Abdullaah Al-Gambi)