Math grade XI

1. Geometric Sequences &
Series

3. Geometric Sequences
We know that a sequence whose consecutive terms have a common difference is
an arithmetic sequence.
In this section, you will study another important type of sequence called a
geometric sequence. Consecutive terms of a geometric sequence have a common
ratio.

4. Geometric Sequences

5. Example 1 of Geometric Sequences

6. Example 1 – Examples of Geometric Sequences

7. Geometric Sequence and Series

8. Geometric Sequence Formula

9. Exercises
Use the formula for the nth term to find the term indicated of the following
geometric sequences

10. Summing terms of a G.P.

11. Summing terms of a G.P.

12. Summing terms of a G.P.
and subtract

13. Summing terms of a G.P

14. Summing terms of a G.P.

15. Exercise : Summing terms of a G.P.

16. The Formula

17. Exercise
Find the sum of the first 20 terms of the geometric series, l
leaving your answer in index form

18. Summing terms of a G.P.

19. SUMMARY

20. Exercises
1. Find the sum of the first 15 terms of the following G.P., giving the answers in
index form
2 + 8 + 32 + . . .
2. Find the sum of the first 15 terms of the G.P.
4 - 2 + 1 + . . . giving your answer correct to 3 significant figures.