1) 28 25 5 21 18 5 14
A. 11 5
B. 10 7
C. 11 8
D. 5 10
E. 10 5
| Answer: Option A
Explanation: This is an alternating subtraction series with the interpolation of a random number, 5, as every third number. In the subtraction series, 3 is subtracted, then 4, then 3, and so on. |
2) 8 11 21 15 18 21 22
A. 25 18
B. 25 21
C. 25 29
D. 24 21
E. 22 26
| Answer: Option B
Explanation: This is an alternating addition series, with a random number, 21, interpolated as every third number. The addition series alternates between adding 3 and adding 4. The number 21 appears after each number arrived at by adding 3. |
3) 9 16 23 30 37 44 51
A. 59 66
B. 56 62
C. 58 66
D. 58 65
E. 54 61
| Answer: Option D
Explanation: Here is a simple addition series, which begins with 9 and adds 7. |
4) 2 8 14 20 26 32 38
A. 2 46
B. 44 50
C. 42 48
D. 40 42
E. 32 26
| Answer: Option B
Explanation: This is a simple addition series, which begins with 2 and adds 6. |
5) 9 11 33 13 15 33 17
A. 19 33
B. 33 35
C. 33 19
D. 15 33
E. 19 21
| Answer: Option A
Explanation: In this alternating repetition series, a random number, 33, is interpolated every third number into a simple addition series, in which each number increases by 2. |
6) 2 3 4 5 6 4 8
A. 9 10
B. 4 8
C. 10 4
D. 9 4
E. 8 9
| Answer: Option D
Explanation: This is an alternating addition series with a random number, 4, interpolated as every third number. In the main series, 1 is added, then 2 is added, then 1, then 2, and so on. |
7) 17 17 34 20 20 31 23
A. 26 23
B. 34 20
C. 23 33
D. 27 28
E. 23 28
| Answer: Option E
Explanation: This is an alternating subtraction series with repetition. There are two different patterns here. In the first, a number repeats itself; then 3 is added to that number to arrive at the next number, which also repeats. This gives the series 17, 17, 20, 20, 23, and so on. Every third number follows a second pattern, in which 3 is subtracted from each number to arrive at the next: 34, 31, 28. |
8) 6 20 8 14 10 8 12
A. 14 10
B. 2 18
C. 4 12
D. 2 14
E. 14 14
| Answer: Option D
Explanation: This is an alternating addition and subtraction series. In the first pattern, 2 is added to each number to arrive at the next; in the alternate pattern, 6 is subtracted from each number to arrive at the next. |
9) 21 25 18 29 33 18
A. 43 18
B. 41 44
C. 37 18
D. 37 41
E. 38 41
| Answer: Option D
Explanation: This is a simple addition series with a random number, 18, interpolated as every third number. In the series, 4 is added to each number except 18, to arrive at the next number. |
10) 75 65 85 55 45 85 35
A. 25 15
B. 25 85
C. 35 25
D. 85 35
E. 25 75
| Answer: Option B
Explanation: This is a simple subtraction series in which a random number, 85, is interpolated as every third number. In the subtraction series, 10 is subtracted from each number to arrive at the next. |
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