Hi all I'm studying sequences and series, the problem I am having is this:- Given the sequence 8 11 14 Find the Nth Term. I have worked out the nth term to be 3N+5, so if I wanted to find the 4th term it would be 3*4+5 = 17. The problem is that I have come across the following formula:- a+(n-1)d where a = 1st term, N is the Nth term, d common difference. If I plug in the values into the above formula I get:- 8+(4-1)*3 = 17 I get the same result?? the problem I am having is that I do not understand how the two are related? Can someone explain??