It means to work out a suitable nth term that is applicable to all terms of a sequence of numbers following a regular pattern.
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No, it will be a formula, because "the nth term" means that you have not defined exactly which term it is. So, you make a formula which works for ANY term in the sequence.
The nth term of an arithmetic sequence = a + [(n - 1) X d]
It is not possible to determine an nth term from a single number.
Nth term With the nth term you substitute the n for the term number (e.g. 50) so the 50th term in 2n+3 would be 2x50+3=103
The nth term is equal to 4n.