2. R=120/27, 414/81, 1404/243, 4698/729, 15552/2187, 51030/6561, 166212/19683, 538002/59049, 1732104/177147.
3. R=63.25,59.5,55.75,52,48.25,44.5,40.75,37,33.25,29.5.
4. R=115.8,103.45,91.1,78.75,66.4,54.05,41.7.
5. R=54/7, 45/7, 36/7, 27/7, 18/7, 9/7, 0/7, -18/7, -27/7, -36/7
6. R=SN=(-3+187)-75/2=(184)-75/2=-13800/2=-6900
7. R=SN=(2+215)164/2=(217)164/2=35588/2=17794.
8. R=SN=(21+276)321/2=(297)321/2=95337/2=47668.5
9. R=AN=-78+(-49)(n-1)=-78-49(n-1)=-127(n-1)=-126.