What are the explicit equation and domain for an arithmetic sequence with a first term of 6 and a second term of 2?

an = 6 − 2(n − 1); all integers where n ≥ 1
an = 6 − 2(n − 1); all integers where n ≥ 0
an = 6 − 4(n − 1); all integers where n ≥ 0
an = 6 − 4(n − 1); all integers where n ≥ 1

A sequence is "arithmetic", if the difference between 2 consecutive terms is always equal.

That is, a sequence   is arithmetic if:

, where d is called the "common difference".
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Consider the sequence with a first term of 6 and a second term of 2

the common difference d is  , 

so we construct the sequence as follows:











.
.
.
thus clearly

and n∈{1, 2, 3, 4...}

 

an = 6 − 4(n − 1); all integers where n ≥ 1