A number is not a form of punctuation, it would become confusing to people to add numbers as punctuation. Therefore none of the numbers should replace the question mark
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9 3 1 2 ?
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In a quotation question, the question mark should be inside the quotation. "Where did Mark go?" asked Zack. Anna replied, "I don't know. Where did he go?"
If this is an algebra question, then you need to give an open sentence with a question mark in it. You might be asking about the ASCII code: ? is 63 (decimal)
I think they are tring to say these numbers 49 7 9 3 64 8 25 and this ends in a ? or they are tring to say 32 32 25 ?14 10 7 5.