1. Geometric Series Starter

2. Write down the algebraic expression for a geometric series a + ar + ar 2 + ar 3 + … + ar n-1

3. The 3 rd term of a geometric series is 75. The first term is 3, find r. r = 5

4. The 4th term of a geometric series is 40. The first term is 5, find r. r = 2

5. The 3rd term of a geometric series is 6. The first term is 24, find r. r = ½

6. The 5th term of a geometric series is 8. The first term is, find r. r = 4

7. The 3rd term of a geometric series is 48. If r=4, find the first term. a = 3

8. The 6th term of a geometric series is -96. If r=2, find the first term. a = -3

9. The 5th term of a geometric series is 48 and the 3 rd term is 12. Find the common ratio and the first term. r = 2 and a = 3

10. The 6th term of a geometric series is 486 and the 3 rd term is 18. Find the common ratio and the first term. r = 3 and a = 2