The nth term in this arithmetic sequence is
an=26+(n-1)(-8).
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Well, isn't that just a lovely pattern we have here? Each term is increasing by 4, isn't that delightful? So, if we want to find the nth term, we can use the formula: nth term = first term + (n-1) * common difference. Just like painting a happy little tree, we can plug in the values and find the nth term with ease.
t(n) = 4n2 - 4n + 2
46n9
Tn = 10 + n2
[ 6n + 8 ] is.