Each term in the sequence is the previous term plus 6.
Therefore:
[tex]a_{n} = a_{n - 1} + 6[/tex]
In some cases using the previous term is not allowed so you would add 6 "n-1 times" to 3
[tex]a_{n} = 3 + 6(n - 1)[/tex]
Therefore to find the 50th term
[tex]a_{50} = 3 + 6(50 - 1)[/tex]
[tex]a_{50} = 297[/tex]
