Given the functions f (n) = 11 and g (n) = - 2 (n - 1), combine them to create an arithmetic sequence, an, and solve for the 31st term.
an = 11 - 2 (n - 1); a31 = - 49
an = 11 - 2 (n - 1); a31 = - 51
an = 11 + 2 (n - 1); a31 = 71
an = 11 + 2 (n - 1); a31 = 73
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