Originally Posted by

**tracey0245** i said geometric series, as that what is comes under i think? the open university(OU) states that i cannot display my questions,and i don't want to cheat at all, hence why i asked for help with how to figure it out

i have done a lot of reading it is an arithmetic sequence, that starts from 3.2 and follows decreases by 0.7 each time, (starts at 3.2)

i have found the recurrent system to descrtibe it, however i am struggling to find the closed form 4 this.

I have been pickling it for ages and the closest i get is :

3.2=(Un-1)0.7

or Un=3.2-(0.7)n-1

hope this is a bit clearer, cheers