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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