Directions: The following series are based on a certain pattern. One of the number in series is wrong. Find that odd one out.
- 5, 19, 61, 190, 565, 1699
61565190169919Option C
Solution:
5*3+4=19
19*3+4=61
61*3+4=187
187*3+4=565
565*3+4=1699.
- 10, 6, 12, 35, 131.5, 591.75
35591.7512131.56Option D
Solution:
10*0.5+1=6
6*1.5+3=12
12*2.5+5=35
35*3.5+7=129.5
129.5*4.5+9=527
- 6, 11, 4, 13, 5, 15
51115134Option A
Solution:
6+5=11
11-7=4
4+9=13
13-11=2
2+13=15.
- 8, 6, 2, 1, 0.5, 0.25
0.56120.25Option B
Solution:
8/4*2=4
4/4*2=2
2/4*2=1
1/4*2=0.5
0.5/4*2=0.25.
- 1, 5, 72, 105, 617, 717
717572105617Option C
Solution:
1+ 22=5
5+43=69
69+62=105
105+83=617
617+102=717.
- 729, 81, 243, 35, 81, 9
24335819NoneOption B
Solution:
729/9=81
81*3=243
243/9=27
27*3=81
81/9=9.
- 8, 12.5, 23, 35, 53, 75.5
233512.575.553Option A
Solution:
8+4.5=12.5
12.5+9=21.5
21.5+13.5=35
35+18=53
53+22.5=75.5.
- 196, 168, 143, 120, 99, 80
9980143196NoneOption D
Solution:
195 ……… 168……… 143……… 120……… 99……… 80
……… 27……… 25……… 23……… 21……… 19.
- 3, 5, 14, 48, 200, 1015
144810152005Option C
Solution:
3*1+2=5
5*2+4=14
14*3+6=48
48*4+8=200
200*5+10=1010.
- 2, 6, 30, 96, 285, 568
28596630568Option D
Solution:
2*6-6=6
6*5-5=25
25*4-4=96
96*3-3=285
285*2-2=568.
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