If you mean numbers of: 37 31 35 71 and 3 then it is 35 because all the other numbers are prime.
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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)
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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
9 3 1 2 ?
?