 # Quantitative Aptitude: Number Series Set 70

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

1. 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.
2. 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.
3. 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. 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 .
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.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.

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