Answer:
= 6n + 1
Explanation:
there is a common difference between consecutive terms , that is
13 - 7 = 19 - 13 = 25 - 19 = 31 - 25 = 6
this indicates the sequence is arithmetic with n th term
= a₁ + (n - 1)d
where a₁ is the first term and d the common difference
here a₁ = 7 and d = 6 , then
= 7 + 6(n - 1) = 7 + 6n - 6 = 6n + 1