series completion verbal reasoning questions

Directions to Solve

In this type of questions, one term in the number series is wrong. Find out the wrong term.

6.

105, 85, 60, 30, 0, – 45, – 90
A.     105    B.     60
C.     0    D.     -45
Answer & Explanation

Answer: Option C

Explanation:

The correct pattern is – 20, – 25, – 30,…..

So, 0 is wrong and must be replaced by (30 – 35) i.e. – 5.

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7.

2, 5, 10, 17, 26, 37, 50, 64
A.     17    B.     26
C.     37    D.     64
Answer & Explanation

Answer: Option D

Explanation:

The terms of the series are (12 + 1), (22 + 1), (32 + 1), (42 + 1), (52 + 1), (62 + 1),

(72+1),…..

So, 64 is wrong and must be replaced by (82 + 1) i.e. 65.

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8.

125, 126, 124, 127, 123, 129
A.     126    B.     124
C.     123    D.     129
Answer & Explanation

Answer: Option D

Explanation:

The correct pattern is + 1, – 2, + 3, – 4, + 5.

So, 129 is wrong and must be replaced by (123 + 5) i.e. 128.

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9.

2, 5, 10, 50, 500, 5000
A.     5    B.     10
C.     50    D.     5000
Answer & Explanation

Answer: Option D

Explanation:

Each term of the series is the product of the preceding two terms.

So, 5000 is wrong and must be replaced by (50 x 500) i.e. 25000.

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10.

1,3,12,25,48
A.     3    B.     12
C.     25    D.     48
Answer & Explanation

Answer: Option C

Explanation:

The terms of the series are (l2 – 02), (22 – l2), (42 – 22), (62 – 32) and (82 – 42).

So, 25 is wrong and must be replaced by (62 – 32) i.e. 27.