In this type of questions, one term in the number series is wrong. Find out the wrong term.
105, 85, 60, 30, 0, - 45, - 90
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.
2, 5, 10, 17, 26, 37, 50, 64
Answer: Option D
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.
125, 126, 124, 127, 123, 129
The correct pattern is + 1, - 2, + 3, - 4, + 5.
So, 129 is wrong and must be replaced by (123 + 5) i.e. 128.
2, 5, 10, 50, 500, 5000
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.
1,3,12,25,48
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.
