1. 1, 10, 7, 20, 13, 30, 19, ... choose which pair of numbers comes next?

a) 26, 40

b) 29, 36

c) 40, 25

d) 25, 31

Explanation: Here, every other number follows a different pattern. In the first series, 6 is added to each number to arrive at the next. In the second series, 10 is added to each number to arrive at the next.

2. 10, 20, 25, 35, 40, 50, 55, ... choose which pair of numbers comes next?

a) 70, 65

b) 60, 70

c) 60, 75

d) 65, 70

Explanation: This is an alternating addition series, in which 10 is added, then 5, then 10, and so on.

3. 42, 40, 38, 35, 33, 31, 28, ... choose which pair of numbers comes next?

a) 25, 22

b) 26, 23

c) 26, 24

d) 25, 23

Explanation: This is an alternating subtraction series in which 2 is subtracted twice, then 3 is subtracted once, then 2 is subtracted twice, and so on.

4. 6, 10, 14, 18, 22, 26, 30, ... choose which pair of numbers comes next?

a) 36, 40

b) 33, 37

c) 38, 42

d) 34, 38

Explanation: This simple addition series adds 4 to each number to arrive at the next.

5. 8, 12, 9, 13, 10, 14, 11, ... choose which pair of numbers comes next?

a) 14, 11

b) 15, 12

c) 8, 15

d) 15, 19

Explanation: This is an alternating addition and subtraction series, in which the addition of 4 is alternated with the subtraction of 3.

6. 2, 4, 6, 8, 10, ... What number should come next?

a) 11

b) 12

c) 13

d) 14

Explanation: This is a simple addition series. Each number increases by 2.

7. 201, 202, 204, 207, ... What number should come next?

a) 205

b) 208

c) 210

d) 211

Explanation: In this addition series, 1 is added to the first number; 2 is added to the second number; 3 is added to the third number; 4 is added to the fourth number; and go on.

8. 544, 509, 474, 439, ... What number should come next?

a) 404

b) 414

c) 420

d) 445

Explanation: This is a simple subtraction series. Each number is 35 less than the previous number.

9. 80, 10, 70, 15, 60, ... What number should come next?

a) 20

b) 25

c) 30

d) 50

Explanation: This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.

10. 2, 6, 18, 54, ... What number should come next?

a) 108

b) 148

c) 162

d) 216

Explanation: This is a simple multiplication series. Each number is 3 times more than the previous number.