# Aptitude - Odd Man Out and Series - Discussion

### Discussion :: Odd Man Out and Series - Find Wrong No. (Q.No.4)

Find out the wrong number in the series.

4.

445, 221, 109, 46, 25, 11, 4

 [A]. 221 [B]. 109 [C]. 46 [D]. 25 [E]. 11

Explanation:

Go on subtracting 3 and dividing the result by 2 to obtain the next number.

Clearly, 46 is wrong.

 Laxmi said: (Nov 17, 2010) series is wrong....think so if wrong number is 46 it should be 445,221,109,53,46(45),21,9,3...

 Thiyagu said: (Dec 16, 2010) it's 46

 Nagendramurthy said: (Jun 17, 2011) Let me explain .. 445-3=442 442/2=221 221-3=218 218/2=109 109-3=106 106/2=53 53-3=50 50/2=25 25-3=22 22/2=11 11-3=8 8/2=4 So after 109 it should be 53.. in the given series it is 46 so Have a nice day..!

 Ammu said: (Jan 26, 2012) Nice explanation by Mr. Nagendramurthy. Thanks.

 Priyanka said: (Jan 24, 2013) 4*2+3=11 11*2+3=25 25*2+3=53 ------------ 46 which is an wrong series. 53*2+3=109 109*2+3=221 221*2+3=445 You might can understand this.

 Satya said: (Jan 9, 2014) I had solved this problem like this. Starting from the end. 4. 4+7=11, 11+14=25, 25+21=46, 46+28=74. So 109 is wrong. Can anybody say whether the way is correct are not? and why?

 Adesh said: (Mar 6, 2014) Yes 109 is wrong because 74* 35=2590 which is not the next number in the given series?

 Bob said: (Nov 21, 2014) Hi but how did you find that it must be subtracted by 3 and multied by 2, seeing the question ? can any one help please.

 Srinithi said: (Jun 26, 2015) Its really a tough question. Could not judge the way in which the series is written?

 Albert said: (Apr 4, 2016) Very tough to find the answer.

 Viji said: (Sep 21, 2016) Good explanation, thank you @Nagendramurthy.

 Raju Rockzz said: (Sep 26, 2016) Super explanation @Nagendramurthy.

 Apoorv said: (Dec 7, 2016) Sum every digit of every number in the series. 4 5 1 1 7 2 4. There's anyhow increase and decrease in the difference of number. Except 1 at the 4th place. Which corresponds to 46!

 Kamlesh said: (Jun 20, 2017) The general form of the series is sigmal of GI (n\2) -1 put n=445 you will get 222.5 but GI of 222.5 is 222 subtract 1 from it you will get 221 and then put 221 on the series and so on.

 B.M.Aakash said: (Jul 31, 2017) Good explanation. Thank you all.

 Lakshu said: (Aug 15, 2017) We can simply do that: 445-221 = 224 224/2 = 112 221-109=112 112/2 = 56 109-46 = 63, So 46 is the wrong answer.

 Akhil said: (Jun 4, 2018) 4+7=11, 11+14=25, 25+28=53, 53+56=109, Start adding with 7 then after 7*2, then the answer with 2. That's it.

 Nandhajhon said: (Dec 12, 2018) Well explained, thanks, @Akhil.

 Kannu said: (May 4, 2019) It should be 53.

 Dhara said: (May 31, 2019) 4. I solved the question in this way. 4+7 = 11, 11+14 = 25, 25+21 = 46, 46+28 = 74. So, 109 should be wrong. I am right, Can anyone tell me?

 Kamali said: (Jun 21, 2019) It could be cracked easily when solved from right to left. Multiplying 2 and adding 3 to the multiplied result. (4*2)+3 = 11. (11*2)+3 = 25. (25*2)+3 = 53. (53*2)+3 = 109. (109*2)+3 = 221. (221*2)+3 = 445. So, 46 is the wrong answer.

 Harshita said: (Jun 8, 2020) @Dhara. Your way of solving the question is wrong because then the given series is proved wrong. 4+7=11. 11+14=25, 25+21=46, 46+28=74, 74+35=109, 109+42=251. Hence the given solution is correct.

 Kartik said: (Dec 4, 2020) 11 is the only one which is prime no. So the answer is option D.