Aptitude - Odd Man Out and Series - Discussion

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"Do not wait for leaders; do it alone, person to person."

- Mother Teresa

Find the odd man out.

2, 5, 10, 17, 26, 37, 50, 64

[A].	50	[B].	26
[C].	37	[D].	64

Answer: Option B

Explanation:

(1*1)+1 , (2*2)+1 , (3*3)+1 , (4*4)+1 , (5*5)+1 , (6*6)+1 , (7*7)+1 , (8*8)+1

But, 64 is out of pattern.

Nishith said: (Mon, Jun 7, 2010 10:18:09 AM)

Also 64 is the only perfect square and rest are not.

Vidhya said: (Wed, Jun 9, 2010 01:04:48 PM)

also series that is obtained after subtracting evry proceeding no. from the previous increases by two

Ankita Sood said: (Sat, Aug 28, 2010 12:42:32 PM)

general term : tn = t(n-1) + 2n-1 where n = 2,3,4,5... t= 2 t1= 2 + 2(2)-1 = 5 t2= 5 + 2(3)-1 = 10 t3= 10 + 2(4)-1 = 17.... and so on where 64 is out of pattern

Vikram said: (Thu, Sep 9, 2010 05:28:01 AM)

Here we can easily subtract the 2 numbers and the difference should be ordered by 3, 5, 7, 9, 11, 13, 15, 17. Like that'but the number 64 is exempted from this case.

Teenu said: (Tue, Dec 28, 2010 11:05:19 AM)

Each number must be added by preceeding odd number 0+2=2 2+3=5 5+5=10 10+7=17 17+9=26 26+11=37 37+13=50 50+15=65 Therefore 64 is odd

Dipanshu said: (Mon, Jan 31, 2011 12:36:19 PM)

Here series of odd no. is added in given no.. like 2+(3)=5 5+(5)=10 10+(7)=17 17+(9)=26 26+(11)=37 37+(13)=50 but 50+15=65 here is 64 so odd no. in this series is 64..... answer is 64;

Rsh said: (Thu, Jun 9, 2011 03:05:32 AM)

The difference between each of them is odd no that is 2+3=5 5+5=10 10+7=17 17+9=26 26+11=37 37+13=50 50+15=64 But there is no 65 and there is 64. So answer is 64.

Satyabrata Mohanty said: (Wed, Jul 6, 2011 12:23:25 AM)

This is the right method to solve it.

Sahil said: (Sun, Jan 8, 2012 10:24:40 PM)

Another way of looking 2+3=5 5+5=10 10+7=17 17+9=26 26+11=37 37+13=50 50+15=65 64 is odd i.e.. add next even number to the result staring from 3 we get 64 odd