6.

2 3 4 5 6 4 8

A. 9 10 B. 4 8

C. 10 4 D. 9 4

E. 8 9

Answer & Explanation

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.

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7.

17 17 34 20 20 31 23

A. 26 23 B. 34 20

C. 23 33 D. 27 28

E. 23 28

Answer & Explanation

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.

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8.

6 20 8 14 10 8 12

A. 14 10 B. 2 18

C. 4 12 D. 2 14

E. 14 14

Answer & Explanation

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.

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9.

21 25 18 29 33 18

A. 43 18 B. 41 44

C. 37 18 D. 37 41

E. 38 41

Answer & Explanation

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.

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10.

75 65 85 55 45 85 35

A. 25 15 B. 25 85

C. 35 25 D. 85 35

E. 25 75

Answer & Explanation

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.