The given sequence is a combination of two series:I. 13, 24, 35, 46, 57 andII. 32, 43, ?, 65, 76The pattern in both I and II is + 11So, missing term = 43 + 11 = 54
182.
Find out the wrong term: 2, 5, 10, 17, 26, 37, 50, 64
(A) 17
(B) 26
(C) 37
(D) 64
Solution:
The term 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
183.
Find the missing term: 589654237, 89654237, 8965423, 965423, ?
(A) 58965
(B) 65423
(C) 89654
(D) 96542
Solution:
The digits are removed one by one from the beginning and the end in order alternately so as to obtain the subsequent terms of the series.
184.
In a given series one term is wrong or missing term: 1, 5, 11, 19, 29, 55
(A) 55
(B) 41
(C) 29
(D) 19
Solution:
The correct sequence is + 4, + 6, + 8, + 10, ............So, next term after 29 = 29 + 12 = 41.The term after 41 will then be (41 + 14) i.e., 55.∴ 41 is missing.
185.
In the following number series a wrong number is given. Find out the wrong number.
1, 3, 10, 21, 64, 129, 356, 777
(A) 129
(B) 21
(C) 10
(D) 356
Solution:
The given pattern is, 2nd term → 1*2+1 = 3 3rd term → 3*3+1 = 10 4th term → 10*2+1 = 21 5th term → 21*3+1 = 64 6th term → 64*2+1 = 129 7th term → 129*3+1= 388 So, 7th term 356 is wrong and must be replaced by 388.
186.
75, 65, 85, 55, 45, 85, 35, ... choose which pair of numbers comes next?
(A) 25, 15
(B) 25, 85
(C) 35, 25
(D) 85, 35
Solution:
This is a simple subtraction series in which a random number, 85, is interpolated as every third number. In the subtraction series, 10 is subtracted from each number to arrive at the next.
187.
Find out the wrong term: 56, 58, 62, 70, 84, 118, 182
(A) 58
(B) 62
(C) 84
(D) 118
Solution:
The correct pattern is + 2, + 4, + 8, + 16, + 32, + 64 i,e., + 2, + 22 , + 23 , + 24 , + 25 , + 26.So, 84 is wrong and must be replaced by (70 + 16) i.e., 86.
188.
8, 6, 9, 23, 87 , ... What number should come next?
(A) 128
(B) 226
(C) 324
(D) 429
Solution:
8 x 1 - 2 = 6 6 x 2 - 3 = 9 9 x 3 - 4 = 23 23 x 4 - 5 = 87 87 x 5 - 6 = 429 ...
189.
Find the missing term: 4, 10, ?, 82, 244, 730
(A) 24
(B) 28
(C) 77
(D) 218
Solution:
Each number in the series is 2 less than thrice the preceding number. So, missing number = (10 x 3) - 2 = 28
190.
84, 78, 72, 66, 60, 54, 48, ... choose which pair of numbers comes next?
(A) 44, 34
(B) 42, 36
(C) 42, 32
(D) 40, 34
Solution:
In this simple subtraction series, each number is 6 less than the previous number.