Aptitude - Odd Man Out and Series - Discussion

Find out the wrong number in the given sequence of numbers.

1. 

582, 605, 588, 611, 634, 617, 600

[A]. 634
[B]. 611
[C]. 605
[D]. 600

Answer: Option A

Explanation:

Alternatively 23 is added and 17 is subtracted from the terms. So, 634 is wrong.

Shashank said: (Sep 18, 2010)  
We can assume two sequence in the problem.

One starting from 582 and other starting with 605 and adding 6 to each term of the sequence.

582+6 = 588
588+6 = 594 instead of this there is 634
and again 594+6=600

Similarly,
605+6=611
611+6=617.

Eldhose said: (Dec 16, 2010)  
I had found the same comparison that mr. Shashank found. I think this is more easy.

L.Gayathri said: (Mar 9, 2011)  
In the series the numbers order increase and decrease. So the series wrong number is 634.

Ansar said: (Jun 15, 2011)  
Alternatively 23 is added and 17 is subtracted from the terms
582+23=605
605-17=588
588+23=611
611-17=594......
634+23=617
617-17=600
In these series Actually the answer is 594 but instead of tat we have 634 so we can consider 634 as the wrong no.

Jegadeesh said: (Jul 3, 2011)  
Well said shashank

.Karthikreddy said: (Jul 19, 2011)  
I agree with shashank

Himanshu said: (Jul 28, 2011)  
Hey guys why can't we found another reasoning. Like I came out with an answer 600 as it is only one divisble by 100 leaving no remainder.

Vinothkumar said: (Sep 21, 2011)  
Odd+6=2nd odd.

Even+6=2nd even.

Sharad Goyal said: (Nov 5, 2011)  
I am satisfied with Ansar.

Yogesh Rai said: (Dec 5, 2011)  
I am satisfied with Ansar....

Gorakh said: (Dec 11, 2011)  
Agree with shashank.

Sammi said: (Feb 1, 2012)  
600 +17
617 +17
634 -23
611 -23
588 +17
605 +17
582
If we consider, +17 added twice then -23, it makes sence so 582 should be the answer

Rekha said: (Mar 7, 2012)  
I am not clear about the explanation given by shashank.

Mukesh said: (Apr 13, 2012)  
Hi Rekha,

582, 605, 588, 611, 634, 617, 600
If you look into the question you can break the series in two parts...
1. 582,588,634,600
2. 605,611,617

By adding 6 in each of the first number of series you will get the odd one as 634.

Sonutalwani said: (Jun 29, 2012)  
582+23=605.
605-17=588.
588+23=611.
611-17=594 => 634 is wrong answer.
594+23=617.
617-17=600.

Vignesh said: (Feb 3, 2014)  
582+6 = 588.
605+6 = 611.
588+6 = 594(but the given answer is 634).
611+6 = 617.
594+6 = 600.

Deepika said: (Jul 29, 2014)  
@Ansar 634+23 is not equal to 617.

Bharath said: (Nov 24, 2014)  
@Sammi. Cool reason. Apparently the world sees these things differently. You can come up with many approaches for the same problem but its safe to stick with the ones that are quite obvious.

FYI, approaching a sequence in reverse might not be so obvious. Instead, look for the trend in numbers and try and picture them on a graph.

Tushar said: (Feb 8, 2015)  
@Shashank why you take 6 please tell me?

Saptarshi Nag said: (Aug 17, 2015)  
If the given explanation is assumed right then the sequence comes like 23, -17, 23, 23, -17, -17. In this case I think that also 600 is odd one.

Chinmay said: (Aug 23, 2015)  
One of the obvious reasons I think is that 617 is prime and all others are composite. Why didn't anybody see this? It is I suppose a stronger reason than simple adding and subtracting.

P. Ganesan said: (May 18, 2017)  
I agree with answer.

Sai said: (Aug 8, 2017)  
Answer 617 only prime number in the given series.

Lakshay said: (Sep 5, 2017)  
Alternatively 23 is added and 17 is subtracted from the terms. So, 634 is wrong.

Balan said: (Sep 12, 2017)  
582-605=23,
605-588=17
588-611=23
634-617=17
611-634=23

So balance 17 +17 =34
Add balance no is 600 +34 =634 ans.

Rabi Kumar said: (Oct 29, 2017)  
There is two series of alternate numbers, we can separate it like:

582, 605, 588, 611, 634, 617, 600

1). 582, 588, 634, 600
2). 605, 611, 617

In each number, we add 6 we get next number, ex- 582+6= 588, 588+6= 594, 594+6=600, So here in series it is given 634 instead of 594. So odd number is (634) answer.

Tilak Raj said: (Mar 7, 2018)  
Very good, thanks for the explanation.

Vivek Mishra said: (Mar 14, 2018)  
If we add 6 to every alternate number the alternate number comes same except 600.

Eg- 582 (1st number) +6 = 588 (3rd number).
605 (2nd number) +6=611 (4th number).

Tushar said: (Apr 25, 2018)  
I Agree @Gayathri.

Ajinkya said: (Jun 29, 2019)  
If we consider the series;

582+23=605 ----> 1st term
605-17=588 ----> 2nd term
588+23=611 ----> 3rd term
611-17=594 ----> (which is not 4th term) so instead of 634, it should be 594.

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