Number Series Completion - Study Mode

[#111] Find out the wrong term: 445, 221, 109, 46, 25, 11, 4
Correct Answer

(B) 46

Explanation

Solution: 3 is subtracted from each number and the result divided by 2 to obtain the next number of the series, So, 46 is wrong and must be replaced by (109 - 3) / 2 i.e., 53.

[#112] Find out the wrong term: 11, 5, 20, 12, 40, 26, 74, 54
Correct Answer

(C) 40

Explanation

Solution: The given sequence is a combination of two series: I: 11, 20, 40, 74 and II: 5, 12, 26, 54 The correct pattern in I: is + 9, + 18, + 36,..... So, 40 is wrong and must be replaced by (20 + 18) i.e., 38.

[#113] Find out the wrong term: 93, 309, 434, 498, 521, 533
Correct Answer

(D) 521

Explanation

Solution: The correct pattern is + 6 3 , + 5 3 , + 4 3 , + 3 3 , ............ So, 521 is wrong and must be replaced by (498 + 3 3 ) i.e., 525.

[#114] Find out the wrong term: 1, 5, 5, 9, 7, 11, 11, 15, 12, 17
Correct Answer

(B) 12

Explanation

Solution: The given sequence is a combination of two series : I: 1, 5, 7, 11, 12 and II: 5, 9, 11, 15, 17 The pattern in both I and II is + 4, + 2, + 4, + 2, So, 12 is wrong and must be replaced by (11 + 2) i.e., 13.

[#115] Find out the wrong term: 1, 3, 12, 25, 48
Correct Answer

(C) 25

Explanation

Solution: The terms of the series are (1 2 - 0), (2 2 - 1 2 ), (4 2 - 2 2 ), (6 2 - 3 2 ), and (8 2 - 4 2 ), So, 25 is wrong and must be replaced by (6 2 - 3 2 ) i.e., 27.