number series logical reasoning questions

11.

11 16 21 26 31 36 41
A.     47 52    B.     46 52
C.     45 49    D.     46 51
Answer & Explanation

Answer: Option D

Explanation:

In this simple addition series, each number is 5 more than the previous number.
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12.

3 8 13 18 23 28 33
A.     39 44    B.     38 44
C.     38 43    D.     37 42
E.     33 38
Answer & Explanation

Answer: Option C

Explanation:

In this simple addition series, each number is 5 greater than the previous number.
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13.

84 78 72 66 60 54 48
A.     44 34    B.     42 36
C.     42 32    D.     40 34
E.     38 32
Answer & Explanation

Answer: Option B

Explanation:

In this simple subtraction series, each number is 6 less than the previous number.
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14.

20 20 17 17 14 14 11
A.     8 8    B.     11 11
C.     11 14    D.     8 9
E.     11 8
Answer & Explanation

Answer: Option E

Explanation:

This is a simple subtraction with repetition series. It begins with 20, which is repeated, then 3 is subtracted, resulting in 17, which is repeated, and so on.
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15.

61 57 50 61 43 36 61
A.     29 61    B.     27 20
C.     31 61    D.     22 15
E.     29 22
Answer & Explanation

Answer: Option E

Explanation:

This is an alternating repetition series, in which a random number, 61, is interpolated as every third number into an otherwise simple subtraction series. Starting with the second number, 57, each number (except 61) is 7 less than the previous number.

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