1. The problem statement, all variables and given/known data I need to find three mathematical series, for the following patterns 1) Sn= 1/n if n is odd, or 1 of n is even. 2) Sn= 0,1,0,.5,1,0,1/3,2/3,0,1/4........ 3) Find a sequence (Sk) which is a subset of the natural numbers in which every positive integer appears infinitely many times......that is, for each n in the Natural numbers, Sk=n for infinately many k's. any ideas??????????????????? 2. Relevant equations I guess they're arent any relevant equations to these. I guess yuo jsut have to get the pattern 3. The attempt at a solution well, I know the first two are similar and thats about all I know. they're not p-series, geometric, alternating, or anything like that so I'm kind of stuck The third one, well, I don't even kow what it means honestly, so can you at least give me a hint?? thanks.