Dear Reader's
Directions (1-2): In the following number
series only one number is wrong. Find out the wrong number.
1. 8 27 64 125 218
343
(1) 27
(2) 218
(3) 125
(4) 343
(5) None of these
2. 19 68 102 129
145 154
(1) 154
(2) 129
(3) 145
(4) 102
(5) None of these
Directions (3-7): What should come in place of
the question mark (?) in the following number series?
3. 0 5 18 43 84
145 ?
(1) 220
(2) 240
(3) 260
(4) 280
(5) None of these
4. 10 17 48 165
688 3475 ?
(1) 27584
(2) 25670
(3) 21369
(4) 20892
(5) None of these
5. 1 3 24 360 8640
302400 ?
(1) 14525100
(2) 154152000
(3) 14515200
(4) 15425100
(5) None of these
6. 12 14 32 102
416 2090 ?
(1) 15522
(2) 12552
(3) 13525
(4) 17552
(5) None of these
7. 10 15 15 12.5
9.375 6.5625 ?
(1) 4.375
(2) 3.2375
(3) 4.6275
(4) 3.575
(5) None of these
Directions (8-12) : What will come in place of
the question mark (?) in each of the following series?
8. 17 52 158 477 ?
4310
(1) 1433
(2) 1432
(3) 1435
(4) 1434
(5) None of these
9. 3 22 ? 673 2696
8093
(1) 133
(2) 155
(3) 156
(4) 134
(5) None of these
10. 6 13 38 ? 532
2675
(1) 129
(2) 123
(3) 172
(4) 164
(5) None of these
11. 286 142 ? 34
16 7
(1) 66
(2) 72
(3) 64
(4) 74
(5) None of these
12. 17 9 ? 16.5 35
90
(1) 5
(2) 15
(3) 10
(4) 20
(5) None of these
Directions (13-17): What will come in place of
the question mark (?) in each of the following series?
13. 2 8 26 ? 242
(1) 78
(2) 72
(3) 82
(4) 84
(5) None of these
14. 3 4 12 ? 196
(1) 45
(2) 40
(3) 41
(4) 49
(5) None of these
15. 9 17 ? 65 129
(1) 32
(2) 24
(3) 35
(4) 33
(5) None of these
16. 7 13 ? 49 97
(1) 27
(2) 25
(3) 23
(4) 29
(5) None of these
17. 5 3 6 ? 64.75
(1) 15
(2) 15.5
(3) 17.5
(4) 17.25
(5) None of these
Directions (18-20) : What will come in place
of the question mark (?) in each of the following number series?
18. 16 8 12 30 ?
(1) 75
(2) 105
(3) 95
(4) 115
(5) None of these
19. 5 6 14 45 ?
(1) 138
(2) 154
(3) 118
(4) 184
(5) None of these
20. 7 12 32 105 ?
(1) 428
(2) 214
(3) 218
(4) 416
(5) None of these
Solution:
1.
(2)
23 =
8
33 =
27
43 =
64
53 =
125
63 =
216 ≠ 218
73 =
343
2.
(4)
19
+ 7² = 19 + 49 = 68
68
+ 6² = 68 + 36 = 104 ≠ 102
104
+ 5² = 104 + 25 = 129
129
+ 4² = 129 + 16 = 145
145
+ 3² = 145 + 9 = 154
3.
(5)
0
+ 5 = 5
5
+ 13 = 18
18
+ 25 = 43
43
+ 41 = 84
84
+ 61 = 145
?
= 145 + 85 = 230
4.
(4)
10
× 1 + 1 × 7 = 10 + 7 = 17
17
× 2 + 2 × 7 = 34 + 14 = 48
48
× 3 + 3 × 7 = 144 + 21 = 165
165
× 4 + 4 × 7 = 660 + 28 = 688
688
× 5 + 5 × 7 = 3440 + 35 = 3475
?
= 3475 × 6 + 6 × 7
=
20850 + 42 = 20892
5.
(3)
1
× 3 = 3
3
× 8 = 24
24
× 15 = 360
360
× 24 = 8640
8640
× 35 = 302400
?
= 302400 × 48
=
14515200
6.
(2)
12
× 1 + 2 × 1 = 12 + 2 = 14
14
× 2 + 2 × 2 = 28 + 4 = 32
32
× 3 + 2 × 3 = 96 + 6 = 102
102
× 4 + 2 × 4 = 408 + 8 = 416
416
× 5 + 2 × 5 = 2080 + 10 = 2090
?
= 2090 × 6 + 2 × 6
=
12540 + 12 = 12552
7.
(1)
10
× 3/2 = 15
15
× 4/4 = 15
15
× 5/6 = 12.5
12.5
× 6/8 = 9.375
9.375
× 7/10 = 6.5625
?
= 6.5625 × 8/12 = 4.375
8.
(3)
The
pattern of the number series is :
17
× 3 + 1 = 51 + 1 = 52
52
× 3 + 2 = 156 + 2 = 158
158
× 3 + 3 = 474 + 3 = 477
477
× 3 + 4 = 1431 + 4 = 1435
9.
(4)
The
pattern of the number series is :
3
× 7 + 1 = 21 + 1= 22
22
× 6 + 2 = 132 + 2 = 134
134
× 5 + 3 = 670 + 3 = 673
673
× 4 + 4 = 2692 + 4 = 2696
10.
(1)
The
pattern of the number series is :
6
× 1 + 1 × 7 = 6 + 7 = 13
13
× 2 + 2 × 6 = 26 + 12 = 38a
38
× 3 + 3 × 5 = 114 + 15 = 129
129
× 4 + 4 × 4 = 516 + 16 = 532
11.
(5)
The
pattern of the number series is :
286/2
- 1 = 143 - 1 = 142
142/2
- l = 71 - l = 70
70/2
- 1 = 35 - 1 = 34
34/2
- 1 = 17- 1 = 16
12.
(3)
The
pattern of the number series is :
17
× 0.5 + 0.5 = 9
9
× 1 + 1 = 10
10
× 1.5 + 1.5 = 16.5
16.5
× 2 + 2 = 35
13.
(5)
The
pattern is :
2
× 3 + 2 = 6 + 2 = 8
8
× 3 + 2 = 24 + 2 = 26
26
× 3 + 2 = 78 + 2 = 80
80
× 3 + 2 = 240 + 2 = 242
14.
(1)
The
pattern is :
3
× 1 + 1² = 3 + 1 = 4
4
× 2 + 2² = 8 + 4= 12
12
× 3 + 3² = 36 + 9 = 45
45
× 4 + 4² = 180 + 16 = 196
15.
(4)
The
pattern is :
9
× 2 - 1 = 18 - 1 = 17
17
× 2 - 1 = 34 - 1 = 33
33
× 2 - 1 = 66 - 1 = 65
65
× 2 - 1 = 130 - 1 = 129
16.
(2)
The
pattern is :
7
× 2 - 1 = 14 - 1 = 13
13
× 2 - 1 = 26 - 1 = 25
25
× 2 - 1 = 50 - 1 = 49
49
× 2 - 1 = 98 - 1 = 97
17.
(3)
The
pattern is :
5
× 0.5 + 0.5 = 2.5 + 0.5 = 3
3
× 1.5 + 1.5 = 4.5 + 1.5 = 6
6
× 2.5 + 2.5 = 15 + 2.5 = 17.5
17.5
× 3.5 + 3.5 = 61.25 + 3.5 = 64.75
18.
(2) The
pattern is :
16
× 0.5 = 8
8
× 1.5 = 12
12
× 2.5 = 30
30
× 3.5 = 105
19.
(4) The
pattern is :
5
× 1 + 1 = 6
6
× 2 + 2 = 14
14
× 3 + 3 = 45
45
× 4 + 4 = 184
20.
(1) The
pattern is :
7
×1 + 1 × 5 = 12
12
× 2 + 2 × 4 = 32
32
× 3 + 3 × 3 = 105
105
× 4 + 4 × 2 = 428
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