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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)
At least two or more numbers are needed to work out the nth term