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