Quantitative Aptitude: Number Series Set 70

January 17, 2018 Shubhra

Directions: The following series are based on a specific pattern. One number in the series is wrong. Find that odd one out.

20, 9, 6, 5, 8, 15
15

5

8

6

9

Option C
Solution:
20*1-11=9
9*2-12=6
6*3-13=5
5*4-14=6 (8)
6*5-15=15.
12, 7, 11, 31, 142, 1145
31

11

1145

142

7

Option D
Solution:
12 * 0.5 + 1 ²= 7
7 * 1 + 2² = 11
11 * 2 + 3²= 31
31 * 4 + 4²= 140 (142)
140 * 8 + 5² = 1145.
2, 6, 20, 46, 98, 182
20

46

98

182

6

Option A
Solution:
2+4*1=6
6+ 4*3=18 (20)
18+4*7=46
46+4*13=98
98+4*21=182.
4. 6, 10, 18, 45, 138, 618
618

45

138

18

10

Option B
Solution:
6…………. 10…………. 18…………. 42 (45)…………. 138…………. 618
……… +4……… +8 ……… +24……… +96 ……… +480
……………… *2……… *3 ……… *4 ……… *5 .
10, 14, 28, 32, 66, 68
68

32

14

66

28

Option D
Solution:
10+4 =14
14*2=28
28+4=32
32*2=64(66)
64+4=68.
2, 12, 30, 68, 130, 222
30

130

12

68

222

Option C
Solution:
1³ + 1=2
2³+2=10 (12)
3³+3=30
4³+4=68
5³+5=130
6³+6=222.
6, 3.5, 4.25, 8.25, 18.5, 48.75
4.25

3.5

18.5

48.75

8.25

Option A
Solution:
6*0.5+0.5=3.5
3.5*1+1=4.5 (4.25)
4.5*1.5+1.5=8.25
8.25*2+2=18.5
18.5*2.5+2.5=48.75.
5, 12, 21, 41, 87, 214
12

21

87

214

41

Option B
Solution:
5+7 = 12
12+(7+3=10) =22 (21)
22+(10+9=19) = 41
41+(19+27=46) = 87
87+(46+81=127) = 214.
20, 6, 5.2, 5.92, 7.96, 10.776
5.92

7.96

5.2

10.776

6

Option C
Solution:
20*0.2 +2 = 5
6*0.3+3 = 4.8 (5.2)
4.8*0.4+4 = 5.92
5.92*0.5+5 =7.96
7.96*0.6+6 = 10.776.
225, 104, 185, 140, 161, 152
161

185

104

140

152

Option D
Solution:
225-11²= 104
104+9²= 185
185-7²= 136 (140)
136+5²= 161
161-3²= 152.