Destiny of Pi Posted May 22, 2017 Report Share Posted May 22, 2017 I've seen this type of question before but I forgot the method!!! Could someone clear up the method for me? Pleaseeee Reply Link to post Share on other sites More sharing options...
SC2Player Posted May 22, 2017 Report Share Posted May 22, 2017 Part a) Let the sum of the first n terms be Sn, so Sn = (3n2 + 5n)/2. The nth term of a sequence is Sn - Sn-1 (can you figure out why?). Simplify the expression to obtain the nth term. I'm assuming that you can figure out part b) after you figure out part a), as it just relies on the definition of what is an arithmetic sequence. 1 Reply Link to post Share on other sites More sharing options...
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