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1. Option C

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.

2. Option B

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

3. Option E

Explanation: This is an alternating subtraction series, which subtracts 5, then 2, then 5, and so on.

4. Option C

Explanation: This is an alternating addition series, with a random number, 35, interpolated as every third number. The pattern of addition is to add 2, add 5, add 2, and so on. The number 35 comes after each “add 2” step.

5. Option B

Explanation: Here, there are two alternating patterns, with every other number following a different pattern. The first pattern begins with 13 and adds 2 to each number to arrive at the next; the alternating pattern begins with 29 and subtracts 3 each time.

6. Option B

Explanation: In this simple addition with repetition series, each number in the series repeats itself, and then increases by 12 to arrive at the next number.

7.Option A

Explanation: This is an alternating repetition series. The number 32 alternates with a series in which each number decreases by 2.

8. Option B

Explanation: This is a simple subtraction series in which a random number, 93, is interpolated as every third number. In the subtraction series, 10 is subtracted from each number to arrive at the next.

9. Option D

Explanation: In this simple addition with repetition series, each number in the series repeats itself, and then increases by 12 to arrive at the next number.

10. Option D

Explanation: This series alternates the addition of 4 with the subtraction of 3.

11. Option C

Explanation: The letters decrease by 1; the numbers are multiplied by 2.

12. Option D

Explanation: This is an alternating division and addition series: First, divide by 2, and then add 8.

13. Option A

Explanation: In this series, 5 is added to the previous number; the number 70 is inserted as every third number.

14. Option B

Explanation: This is a simple alternating addition and subtraction series. The first series begins with 8 and adds 3; the second begins with 43 and subtracts 2.