6. Look at this series: 21, 9, 21, 11, 21, 13, 21, … What number should come next?

A. 14

B. 15

C. 21

D. 23

7. Look at this series: 58, 52, 46, 40, 34, … What number should come next?

A. 26

B. 28

C. 30

D. 32

8. Look at this series: 3, 4, 7, 8, 11, 12, … What number should come next?

A. 7

B. 10

C. 14

D. 15

9. Look at this series: 8, 22, 8, 28, 8, … What number should come next?

A. 9

B. 29

C. 32

D. 34

10. Look at this series: 31, 29, 24, 22, 17, … What number should come next?

A. 15

B. 14

C. 13

D. 12