582, 605, 588, 611, 634, 617, 600
634
611
605
600
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Answer : Option A
Explanation :
Alternatively 23 is added and 17 is subtracted from the terms. So, 634 is wrong.
22, 33, 66, 99, 121, 279, 594
33
121
279
594
Answer : Option C
Each of the number except 279 is a multiple of 11.
8, 13, 21, 32, 47, 63, 83
47
63
32
83
Go on adding 5, 8, 11, 14, 17, 20.
So, the number 47 is wrong and must be replaced by 46.
1, 8, 27, 64, 124, 216, 343
8
27
64
124
Answer : Option D
The numbers are 13, 23, 33, 43 etc. So, 124 is wrong; it must have been 53 i.e., 125.
1, 2, 6, 15, 31, 56, 91
31
91
56
15
Answer : Option B
1, 1 + 12 = 2, 2 + 22 = 6, 6 + 32 = 15, 15 + 42 = 31, 31 + 52 = 56, 56 + 62 = 92
Last number of given series must be 92 not 91.
52, 51, 48, 43, 34, 27, 16
34
43
48
Subtract 1, 3, 5, 7, 9, 11 from successive numbers.
So, 34 is wrong.
4, 6, 8, 9, 10, 11, 12
10
11
12
9
Each number is a composite number except 11.
105, 85, 60, 30, 0, -45, -90
0
85
-45
60
Subtract 20, 25, 30, 35, 40, 45 from successive numbers.
So, 0 is wrong.
5, 16, 6, 16, 7, 16, 9
7
6
None of these
Terms at odd places are 5, 6, 7, 8 etc. and each term at even place is 16.
So, 9 is wrong
125, 127, 130, 135, 142, 153, 165
130
142
153
165
Prime numbers 2, 3, 5, 7, 11, 13 are to be added successively.
So, 165 is wrong.
46080, 3840, 384, 48, 24, 2, 1
1
2
24
384
The terms are successively divided by 12, 10, 8, 6, ...etc.
So, 24 is wrong, it should be 8 (48/6 = 8).
6, 13, 18, 25, 30, 37, 40
25
30
37
40
The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5.
So, 40 is wrong.
36, 54, 18, 27, 9, 18.5, 4.5
4.5
18.5
54
18
The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 does not satisfy it.
56, 72, 90, 110, 132, 150
72
110
132
150
The numbers are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13.
So, 150 is wrong.
25, 36, 49, 81, 121, 169, 225
36
49
169
The numbers are squares of odd natural numbers, starting from 5 up to 15.
So, 36 is wrong.
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