number series logical reasoning questions

Look carefully for the pattern, and then choose which pair of numbers comes next.
16.

2 44 4 41 6 38 8
A.     10 12    B.     35 32
C.     34 9    D.     35 10
E.     10 52
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17.

17 32 19 29 21 26 23
A.     25 25    B.     20 22
C.     23 25    D.     25 22
E.     27 32
Answer & Explanation

Answer: Option C

Explanation:

Here, there are two alternating patterns. The first begins with 17 and adds 2; the second begins with 32 and subtracts 3.
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18.

17 14 14 11 11 8 8
A.     8 5    B.     5 2
C.     8 2    D.     5 5
E.     5 8
Answer & Explanation

Answer: Option D

Explanation:

In this simple subtraction with repetition series, each number is repeated, then 3 is subtracted to give the next number, which is then repeated, and so on.
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19.

10 34 12 31 14 28 16
A.     25 18    B.     30 13
C.     19 26    D.     18 20
E.     25 22
Answer & Explanation

Answer: Option A

Explanation:

Two patterns alternate here. The first pattern begins with 10 and adds 2 to each number to arrive at the next; the alternating pattern begins with 34 and subtracts 3 each time.
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20.

11 14 14 17 17 20 20
A.     23 23    B.     23 26
C.     21 24    D.     24 24
E.     24 27
Answer & Explanation

Answer: Option A

Explanation:

This is a simple addition series with repetition. It adds 3 to each number to arrive at the next, which is repeated before 3 is added again.

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