3n is the simplest, but you could also write it as 3*n or 3.n or 3xn.
The problem with the last form is that it could represent the product of 3 and x and n.
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You can write a multiplication sign in between (a point, or a cross), but this is usually just written as "3n".
You can write it as 4*N or 4N.
For n=number 12xn, (12)(n), (12)n, 12(n), or 12n
"n divided into 3" = 3/n
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