Directions: The following series are based on a certain pattern. One of the number in series is wrong. Find that odd one out.
- 180, 36, 9, 3, 2, 1.5
361.5239Option C
Solution:
180/5=36
36/4=9
9/3=3
3/2=1.5 (2)
1.5/1=1.5.
- 5, 8, 12, 18, 27, 42
812274218Option D
Solution:
5…………8…………12…………18…………27…………40
…….3…………4…………6………… 9………….13
………….1…………2…………3…………4
- 15, 33, 60, 87, 123, 165
165338760123Option D
Solution:
15 +6*3=33
33+8*3=57 (60)
57+10*3=87
87+12*3=123
123+14*3=165.
- 320, 312, 300, 264, 200, 72
72264300200312Option C
Solution:
320-8=312
312-16=296(300)
296-32=264
264-64=200
200-128=72.
- 5, 14, 39, 92, 169, 290
923916929014Option A
Solution:
5 + 32 =14
14+52=39
39+72=88 (92)
88+92=169
169+112=290.
- 25, 26, 22, 31, 18, 40
4018262231Option B
Solution:
25 + 12 =26
26-22=22
22+32=31
31-42=15 (18)
15+52=40.
- 5, 6, 14, 45, 184, 930
18414930456Option C
Solution:
5*1+1=6
6*2+2=14
14*3+3=45
45*4+4=184
184*5+5=925 (930).
- 2, 7, 31, 125, 483, 1923
7483311251923Option D
Solution:
2*4-1=7
7*4+3=31
31*4-5=119 (125)
119*4+7=483
483*4-9=1923.
- 340, 213, 122, 61, 24, 8
86121312224Option A
Solution:
73-3 =340
63 -3=213
53-3=122
43-3=61
33-3=24
23-3=5(8).
- 4, 3, 4.5, 9.5, 20, 53
209.520534.5Option B
Solution:
4*0.5+1=3
3*1+1.5=4.5
4.5*1.5+2=8.75(9.5)
8.75*2+2.5=20
20*2.5+3=53.
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