The exclamation mark almost always indicates factorial, i.e. n! = 1*2*3*...*n. Therefore 4! would be 1*2*3*4 = 24. Additionally, the exclamation mark can indicate negation, e.g. in computer programming and logic.
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Of all the things that an exclamation mark can convey, uncertainty would not be one of them. You may use a question mark to convey uncertainty within or outside of a parenthetical.
Igual>>> ALGEBRA
"And" in algebra usually means addition.
One space is sufficient.