1. Sum Of An Arithmetic Series

2. Sum Of An Arithmetic Series

3. Sum Of An Arithmetic Series

4. Sum Of An Arithmetic Series

5. Sum Of An Arithmetic Series

6. Sum Of An Arithmetic Series if we know l

7. Sum Of An Arithmetic Series if we know l otherwise;

8. Sum Of An Arithmetic Series if we know l otherwise;

9. Sum Of An Arithmetic Series if we know l otherwise;

36. Exercise 6I; 2ace, 4bd, 5ac, 7c, 8f, 9, 11ac, 13be, 16a 17bc, 19, 20a*