a + (n-1)d = last number
where a is the first number
d is the common difference.
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my nth term maths is very tuff because its syallabus is changed
It means to work out a suitable nth term that is applicable to all terms of a sequence of numbers following a regular pattern.
The nth term of an arithmetic sequence = a + [(n - 1) X d]
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.
"Non-linear sequence" is a generic term for just about ANY sequence, each of which will have a different equation.