Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
26.
5, 27, 61, 122, 213, 340, 509
A. 27 B. 61
C. 122 D. 509
Answer & Explanation
Answer: Option A
Explanation:
The terms of the series are (23 – 3), (33 – 3), (43 – 3), (53 – 3), (63 – 3), (73 – 3),
(83-3).
So, 27 is wrong and must be replaced (33 – 3) i.e. 24.
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27.
3, 7, 15, 39, 63, 127, 255, 511
A. 15 B. 39
C. 63 D. 127
Answer & Explanation
Answer: Option B
Explanation:
The correct pattern is x 2 + 1.
So, 39 is wrong and must be replaced by (15 x 2 + 1) i.e. 31.
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28.
380, 188, 92, 48, 20, 8, 2
A. 8 B. 20
C. 48 D. 188
Answer & Explanation
Answer: Option C
Explanation:
The correct pattern is – 192, – 96, – 48, – 24, – 12, – 6.
So, 48 is wrong and must be replaced by (92 – 48) i.e. 44.
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29.
16, 22, 30, 45, 52, 66
A. 30 B. 45
C. 52 D. 66
Answer & Explanation
Answer: Option B
Explanation:
The correct pattern is + 6, + 8, + 10, + 12, + 14.
So, 45 is wrong and must be replaced by (30 + 10) i.e. 40.
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30.
10, 26, 74, 218, 654, 1946, 5834
A. 26 B. 74
C. 218 D. 654
Answer & Explanation
Answer: Option D
Explanation:
The correct pattern is x 3 – 4.
So, 654 is wrong and must be replaced by (218 x 3 – 4) i.e. 650.