2, 8, 14, 20, 26, 32, 38, ... choose which pair of numbers comes next?
(A) 2, 46
(B) 44, 50
(C) 42, 48
(D) 40, 42
Solution:
This is a simple addition series, which begins with 2 and adds 6.
94.
21, 9, 21, 11, 21, 13, 21, ... What number should come next?
(A) 14
(B) 15
(C) 21
(D) 23
Solution:
In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.
95.
Find out the wrong term: 5, 27, 61, 122, 213, 340, 509
(A) 27
(B) 61
(C) 122
(D) 509
Solution:
We have :I: 5 27 61 122 213 340 509II: 22 34 61 91 127 169III: 12 27 30 36 42IV: 15 3 6 ; 6 Clearly, the given series becomes a triangular pattern series if each term in IV: is 6. Again, in II: 34 must be replaced by (61 - 24) i.e., 37 and 22 by (37 - 18) i.e., 19. Thus, in the given series, 27 is wrong and must be replaced by (5 + 19) i.e., 24.
96.
8, 11, 21, 15, 18, 21, 22, ... choose which pair of numbers comes next?
(A) 25, 18
(B) 25, 21
(C) 25, 29
(D) 24, 21
Solution:
This is an alternating addition series, with a random number, 21, interpolated as every third number. The addition series alternates between adding 3 and adding 4. The number 21 appears after each number arrived at by adding 3.
97.
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.
98.
Find out the wrong term: 1, 5, 9, 15, 25, 37, 49
(A) 9
(B) 15
(C) 25
(D) 37
Solution:
The terms of the given series are 12 , (22 + 1), 32 , (42 + 1), 52 , (62 + 1), 72 So, 15 is wrong and must be replaced by (42 + 1) i.e., 17.
99.
Find out the wrong term: 46080, 3840, 384, 48, 24, 2, 1
(A) 384
(B) 48
(C) 24
(D) 2
Solution:
The correct pattern is ÷ 12, ÷ 10, ÷ 8, ÷ 6,.........So, 24 is wrong and must be replaced by (48 ÷ 6) i.e., 8.
100.
1.5, 2.3, 3.1, 3.9, ... What number should come next?
(A) 4.2
(B) 4.4
(C) 4.7
(D) 5.1
Solution:
In this simple addition series, each number increases by 0.8.