### 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 |
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Answer: Option C 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. |

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