Aptitude - Odd Man Out and Series - Discussion

Find out the wrong number in the series.

5. 

190, 166, 145, 128, 112, 100, 91

[A]. 100
[B]. 166
[C]. 145
[D]. 128
[E]. 112

Answer: Option D

Explanation:

Go on subtracting 24, 21, 18, 15, 12, 9 from the numbers to get the next number.

190 - 24 = 166
166 - 21 = 145
145 - 18 = 127 [Here, 128 is placed instead of 127]
127 - 15 = 112
112 - 12 = 100 ... and so on.

Therefore, 128 is wrong.


Manasa said: (Jul 12, 2011)  
How 128 is wrong? can you explain in detail please ?

Manisha said: (Dec 18, 2011)  
Answer is not correctly explained. Please anyone explain.

Roy said: (Dec 29, 2011)  
190-166= 24 =8x3
166-145= 21 =7x3
145-127= 18 =6x3 <=128 is wrong
127-112= 15 =5x3
112-100= 12 =4x3
100-91 = 9 =3x3

Jyoti said: (Nov 25, 2012)  
91+9=100
100+12=112
112+15=127 = 128 is wrong
127+18=145
145+21=166
166+24=190

Joyto Roy said: (May 1, 2014)  
Out of all the numbers only 100 is a perfect square.

So, in the series 100 is only the odd one out.

Hamsa said: (Apr 12, 2015)  
91-1 = 90.
100-1 = 99.
112-1 = 111.
128-1 = 127.
145-1 = 144.
166-1 = 165.

90, 99, 111, 144, 165 all are divisible by 3.

Except 127, So 128 is odd.

Arun Kumar K said: (Jul 2, 2016)  
Can anyone make more understanding solution?

Loyid said: (Sep 21, 2016)  
190 - 24(3 x 8) = 166,
166 - 21(3 x 7) = 145,
145 - 18(3 x 6) = 127 -----> Correct and 128 is wrong,
127 - 15(3 x 5) = 112,
112 - 12(3 x 4) = 100 -----> Multiples of 3 is subtracted from each number.

Apoorv said: (Dec 7, 2016)  
100 could also be the answer as it's only prefect squared number in the series.

Ashish Jat said: (Apr 13, 2017)  
When dividing numbers by 3 you will get remainder 1 but in 128 you will get remainder 2.

Hope it will help.

Sujatha said: (Oct 5, 2022)  
Anyone, Please explain it clearly.

Post your comments here:

Name *:

Email   : (optional)

» Your comments will be displayed only after manual approval.