number series logical reasoning questions

Look carefully for the pattern, and then choose which pair of numbers comes next.
1.

28 25 5 21 18 5 14
A.     11 5    B.     10 7
C.     11 8    D.     5 10
E.     10 5
Answer & Explanation

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.
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2.

8 11 21 15 18 21 22
A.     25 18    B.     25 21
C.     25 29    D.     24 21
E.     22 26
Answer & Explanation

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.
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3.

9 16 23 30 37 44 51
A.     59 66    B.     56 62
C.     58 66    D.     58 65
E.     54 61
Answer & Explanation

Answer: Option D

Explanation:

Here is a simple addition series, which begins with 9 and adds 7.
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4.

2 8 14 20 26 32 38
A.     2 46    B.     44 50
C.     42 48    D.     40 42
E.     32 26
Answer & Explanation

Answer: Option B

Explanation:

This is a simple addition series, which begins with 2 and adds 6.
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5.

9 11 33 13 15 33 17
A.     19 33    B.     33 35
C.     33 19    D.     15 33
E.     19 21
Answer & Explanation

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.