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.