
Patrick B. answered 12/03/18
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Well if it is 3n<18 then n < 6, so any number less than 6 will suffice.
(Note that if it is less than or EQUAL to, then 6 will also work)
On the other hand if it is 3n > 18, then n > 6, so any number greater
than 6 will suffice. Likewise, 6 is included if it is greater than or equal.