If you have this series: 1,2,3,4,5,6,7,8
The 8th term is 8 and the n-th term is n.
But if you have this series: 2,4,6,8,10,12,14,16
The 8th term is 16 and the n-th term is 2n
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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.
The Nth term for a triangle number is: 0.5n(n+1)
If you mean: 6 12 18 24 then the nth term is 6n