Discussion :: Odd Man Out and Series  Odd Man Out (Q.No.5)
Find the odd man out.
5.  6, 9, 15, 21, 24, 28, 30 

Answer: Option A Explanation:
Each of the numbers except 28, is a multiple of 3.

Kousik said: (Jul 8, 2011)  
Each of the numbers except 28, is a multiple of 3. 
Anil said: (Oct 15, 2011)  
28, 24, 30 are devisible by 2 only 21 is not divisible by 2. So, why answer is 28 and why not 21? 
Swati said: (Oct 24, 2011)  
Yes I had confused about this question because each digit divisible by 2 but 21 is only digit its'nt divisible by 2, so the answer is 21 not 28. 
Richa Aggarwal said: (Nov 8, 2011)  
All the numbers are divided by 3 but 28 is not. 
Rama Krishna Rao said: (Dec 6, 2011)  
Here it is a number series 3 is added to first number and 6 is added to next two numbers 6+3=9 9+6=15 15+6=21 21+3=24 24+6=30 
Vimal said: (Jun 1, 2012)  
6, 9, 15, 21, 24, 28, 30 All the numbers are addition of 3, except 28 3+3=6 3+3+3=9 3+3+3+3+3=15 3+3+3+3+3+3+3=21 3+3+3+3+3+3+3+3=24 3+3+3+3+3+3+3+3+3=27 3+3+3+3+3+3+3+3+3+3=30 or (another method is all the nos. are coming in table of 3, except 28.) 3*2=6 3*3=9 3*5=15 3*7=21 2*8=24 2*9=27 3*10=30 
Sonutalwani said: (Jun 27, 2012)  
3*2=6 3*3=9 3*5=15 3*7=21 3*8=24 3*10=30 But 28 is not divided by 3. 
Mahesh said: (Aug 18, 2012)  
All the numbers are divided by 3 but 28 is not divisble 
Sree said: (Jul 18, 2013)  
By adding two digit numbers we get only single digit but 28 we get again two digits. For 21 2+1 = 3 so on. But 28 2+8 = 10. 
Pavi said: (Jan 25, 2014)  
All numbers are divided by 3 but 28 is not divisible by 3. 
Arpit Kumar Gaur said: (Jan 30, 2015)  
Very simple just see the table of 3. 3*2=6. 3*3=9. 3*4=12. 3*5=15. 3*6=18. 3*7=21. 3*8=24. 3*9=27. 3*10=30. So 28 is not a multiple by 3. So wrong answer is 28. 
Tushar said: (Mar 18, 2015)  
As 9 is the only perfect square among all the options, hence 9 should be the answer. 
Sudheer Reddy said: (Aug 14, 2015)  
All are divisible by 3 except 28. 
Ch.Geethika Naidu said: (Sep 30, 2015)  
All are divisible by 3 except 28 because 28 is divisible by 2. 
Ayub said: (Feb 25, 2016)  
All are divisible 3 but 28 not divisible by 3. 
Agniva Saha said: (Oct 6, 2016)  
Answer. 21 because except 21 all are divisible by 2. 
Shanaya said: (Mar 22, 2017)  
All of these except 21 are even number and divisible by 2. 
Bogale said: (Apr 29, 2017)  
Except 21 all are an even number. Except 28 all are divisible by 3. So which one the answer? Both are odd. So both are the answer or the question is wrong. 
Tapas said: (Oct 8, 2017)  
Only 30 is divided by 10. 
Aparna said: (Jan 27, 2019)  
3*2 = 6 3*3 = 9 3*4 = 12 3*5 = 15 3*6 = 18 3*7 = 21 3*8 = 24 3*9 = 27 3*10 = 30. But 28 is not multiple of 3 so the answer is 28. 
Mangi said: (Aug 16, 2019)  
According to me, the answer is 21. Every option is multiple of 2 except it. 
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