لَا بُدَّ is used to mean the certainty of something. مِنْ comes after it.
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Certainly you have to sit for the exam. |
لَابُدَّ مِنَ الإِخْتِبَارِ |
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Certainly we have to die. |
لَابُدَّ مِنَ الْمَوْتِ |
But if it comes after infinite verb then مِنْ can be dropped.
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You must have to write to him. |
لَابُدَّ أَنْ تَكْتُبَ لَهُ |
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You must have to know how to operate computer. |
لَابُدَّ أَنْ تَتَعَلَّمُوْا تَشْغِيْلَ الحَاسُوْبِ |
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