Question 1201812
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Answer: {{{a[n] = 2n}}}


Explanation:
n = a positive integer
a1 = 2 is the first term
d = 2 is the common difference, the gap between terms
{{{a[n] = matrix(1,2,nth,term)}}}


{{{a[n] = a[1]+d(n-1)}}}


{{{a[n] = 2+2(n-1)}}}


{{{a[n] = 2 + 2n - 2}}}


{{{a[n] = 2n}}}


As a check, let's plug in say n = 3
{{{a[n] = 2n}}}


{{{a[3] = 2*3}}}


{{{a[3] = 6}}}
The third term is indeed 6. I'll let you check the other values of n.
n = 1, 2, 3, ...