The general (or nth) term is given by the equation
t(n) = a + (n-1)d
where
a is the first term
and
d is the common difference between successive terms.
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an = a1 + d(n - 1)
It is an arithmetic sequence if you can establish that the difference between any term in the sequence and the one before it has a constant value.
The nth term of an arithmetic sequence = a + [(n - 1) X d]
An arithmetic sequence
Arithmetic Sequence