# Aptitude - Odd Man Out and Series - Discussion

### Discussion :: Odd Man Out and Series - Find Wrong No. (Q.No.5)

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

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.