Is this an arithmetic progression (AP) or geometric progression (GP)?
AP's have constant differences, while GP's have constant ratios.
7, 11, 15, 19, 23
11-7=4, 15-11=4, 19-15=4, 23-19=4
(constant difference d=4, therefore AP)
11/7, 15/11, 19/15, 23/19 (different, so NOT GP).
The nth term of an AP is:
it just says work out the nth term for the those numbers
I hope you did not just read the first line of my response.
I was asking myself that question (hope you do the same). The rest of the response followed.