Directions: The following series are based on a specific pattern. One number in the series is wrong. Find that odd one out.
- 14, 21, 35, 63, 121, 231
631213523114Option B
Solution:
14………… 21…………. 35…………… 63…………… 121(119)……….. 231
………7 …………. 14 ………. 28 …………… 56 ……….. 112.
- 12, 7, 8, 13, 27, 69, 206.5
27206.569128Option C
Solution:
12*0.5+1=7
7*1+1=8
8*1.5+1=13
13*2+1=27
27*2.5+1=69(68.5)
68.5*3+1=206.5.
- 26, 34, 61, 125, 254, 466
612543446626Option B
Solution:
26+23=34
34+33=61
61+43=125
125+53=254(250)
250+63=466.
- 350, 304, 265, 240, 224, 215
240350224304215Option D
Solution:
350-72=304(301)
301-62=265
265-52=240
240-42=224
224-32=215.
- 25, 128, 518, 1553, 3112, 3119
518155312831193112Option A
Solution:
25*5+3=128
128*4+4=518(516)
516*3+5=1553
1553*2+6=3112
3112*1+7=3119.
- 5, 55, 495, 3465, 17455, 51975
4951745534655551975Option B
Solution:
5*11=55
55*9=495
495*7=3465
3465*5=17455(17325)
17325*3=51975.
- 7, 4, 6, 9, 20, 52.5, 160.5
52.59160.5620Option D
Solution:
7*1/2+1/2=4
4*1+1=6(5)
5*3/2+3/2=9
9*2+2=20
20*5/2+5/2=52.5
52.5*3+3=160.5.
- 14, 15, 29, 90, 351, 1756
3512990151756Option C
Solution:
14*1+1=15
15*2-1=29
29*3+1=90(88)
88*4-1=351
351*5+1=1756.
- 33, 38, 45, 54, 65, 80
4580655438Option B
Solution:
33+5=38
38+7=45
45+9=54
54+11=65
65+13=80(78).
- 16, 8, 12, 30, 105, 475
47581210530Option A
Solution:
16*1/2=8
8*3/2=12
12*5/2=30
30*7/2=105
105*9/2=475(472.5).
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