Why we follow DMAS rule? Why its not SAMD or MSAD? Are there any derivations for it?

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I've problems with that BODMAS rule. I lost my 5 marks in the test for that. Why we should follow that DMAS rule? Why it is not any other combination? Are there any derivations for it? PS:-Sorry I'm confused with the tags with this question. I don't need any easy way to remember it.