Directions: The following series are based on a certain pattern. One of the number in series is wrong. Find that odd one out.
- 1, 2, 5, 29, 677, 458330
6774583302925Option C
Solution:
1*1+1=2
2*2+1=5
5*5+1=26
26*26+1=677
677*677+1=458330.
- 20, 24, 33, 49, 74, 112
24112497433Option B
Solution:
20+22=24
24+32=33
33+42=49
19+52=74
74+62=110.
- 12, 27, 57, 105, 162, 237
3872521057227Option C
Solution:
12+(15*1)=27
27+(15*2)=57
57+(15*3)=102
102+(15*4)=162
162+(15*5)=237.
- 50, 90, 155, 240, 375, 577.5
577.515524037590Option B
Solution:
50…………90…………150…………240…………375…………577.5
……..40…………60…………90…………..135…………202.5
…………..*1.5………..*1.5…………*1.5…………*1.5.
- 1, 9, 125, 149, 729, 121
7299125149121Option D
Solution:
13 = 1
32 = 9
53 = 125
72 = 49
93 = 729
112 = 121.
- 4, 8, 16, 54, 224, 1130
854113022416Option A
Solution:
4*1+2=6
6*2+4=16
16*3+6=54
54*4+8=224
224*5+10=1130.
- 2, 10, 30, 68, 130, 225
683010225130Option D
Solution:
13 +1=2
23 +2=10
33 +3=30
43 +4=68
53 +5=130
63 +6=222.
- 60, 490, 1920, 3840, 3840, 1920
1920384049060NoneOption C
Solution:
60*8=480
480*4=1920
1920*2=3840
3840*1=3840
3840*0.5=1920.
- 2, 16, 44, 105, 212, 436
1052124416436Option A
Solution:
2*2+12=16
16*2+12=44
44*2+12=100
100*2+12=212
212*2+12=436.
- 3.5, 7, 26, 84, 420, 2520
842625204207Option B
Solution:
3.5*2=7
7*3=21
21*4=84
84*5=420
420*6=2520.
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