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Solution. (8): the first, third and fifth numbers indicate a progression of two. The seventh number therefore will be 8
Answer. b

10. 16, 4, 2, 25, 5, 3, 36, 6, ?

a. 2
b. 3
c. 4
d. 7
Solution. (4): divide into sets of 3 numbers. The second number is the square root of the first. Then subtract two to get the third number.
Answer. c

11. 1, 16, 2, 15, 3, 14, 4,?

a. 11
b. 12
c. 13

d. 14
Solution. (13): Starting with the second number, every other number goes down by one.
Answer. c

12. 27, 9, 21, 3, 17, 7, 13, ?

a. 14
b. 2
c. 4
d. 12

Solution. (4) Divide onto sets of 2 numbers. The sum of the digits of the first number equals the second number. The sum of the digits of 13 = 4
Answer. c

13. 6, 18, 5, 15, 4, 12, 3, ?

a. 19
b. 9
c. 11
d. 13
Solution. (9): Divide the sets of 2 numbers. The first number multiplied by 3 equals the second number.
Answer. b

14. 3, 5, 8, 7, 4, 6, 10, 9, 5, 7, 12, ?

a. 11
b. 6
c. 13