Aptitude - Odd Man Out and Series - Discussion

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

3. 

8, 13, 21, 32, 47, 63, 83

[A]. 47
[B]. 63
[C]. 32
[D]. 83

Answer: Option A

Explanation:

Go on adding 5, 8, 11, 14, 17, 20.

So, the number 47 is wrong and must be replaced by 46.


Ankit said: (Sep 15, 2010)  
I don't get it guys. Someone help please.

Raghava said: (Sep 16, 2010)  
Its very simple yaar. Difference betweenn 8 & 13 is 5, 13 & 21 is 8, 21 & 32 is 11. Add 3 numbers for all. Numbers you've to add is 5, 8, 11, 14, 17. 20. Got it?

Divya said: (Feb 13, 2011)  
Sorry I cant get this. Someone help how we got 14 to add.

Abhijeet said: (Feb 19, 2011)  
The "difference between 47 and 63" is not 17 as stated. "Its 16"

Sanjay said: (May 16, 2011)  
I cant get this can you give better explanation.

Sindhu said: (Jun 12, 2011)  
See friends,

Difference between 8 & 13 is 5.ie if v subtract 13-8 v get 5
Difference between 13 & 21 is 8.ie if v subtract 21-13 v get 8(5+3)
Difference between 21 &32 is 11.ie if v subtract 32-21 v get 11(8+3)

Likewise difference between 32 & 47 is 15.ie if v subtract 47-32 v get 15 But it doesnt satify the condition 11+3=14..hence 47 is wrong no..

Difference between 8 & 13 is 5.ie if v subtract 13-8 v get 5

Nagendramurthy said: (Jun 17, 2011)  
see friends..

second no - first no.
third no - second no ..
series go like that ..
that is
13-8=5
21-13=8
32-21=11

47-32=15
63-47=16

see in about two line we have to 14 and 17 respectively..
so that the series contiunes as the difference of 3 after subtracting the next no from previous no ..
when we replace 47 by 46 ..

46-32=14
63-46=17
83-63=20..

so the 5.. 8.. 11.. 14.. 17... 20.. the difference is 3..

i think u have clear ur doubts friends... thank u ..

Sudheer said: (Sep 8, 2011)  
STEP1......8+5=13;
2......13+5+3=21;
3......21+5+3+3=32;
4......32+5+3+3+3=46 here in the series it is 47
5......46+5+3+3+3+3=63;
6......63+5+3+3+3+3+3=83; so 47 is wrong

Sks said: (Jan 3, 2012)  
Sudheer is right. Thank you, sudheer.

Sonutalwani said: (Jun 29, 2012)  
8+5=13 (5)
13+8=21 (5+3)
21+11=32 (5+6)
32+14=46 (5+9)
46+17=63 (5+12)
63+20=83 (5+15)

Subash said: (Jul 18, 2013)  
Add 5 to 1st number.

Then add (5+3) to the next number.

Then add (5+3+3) to the next number.

Then add (5+3+3+3) to the next number and so on.

So 47 is wrong it must be replaced by 46.

Sushant L said: (Nov 21, 2014)  
Its starts with 5 add it in 8 you get 13.

Add 3 in to 5 you get 8 add it in 13 you get 21.

Add 3 In to 8 you get 11 add it in 21 I get 32 and so on.

Arnab Roy said: (Jul 18, 2015)  
I answered 32 because I thought it was the only even number in the entire series. What's wrong in that?

Arun said: (Sep 3, 2015)  
@Arnab.

There is 8.

Anbu said: (Sep 29, 2015)  
How to identified I there use 5, 8, 11, 14, 17, 20 like this?

Sailesh said: (Dec 5, 2015)  
Find the next number in the series 1, -1, 2, 3, 32, ?

Sibasish said: (Sep 8, 2016)  
The difference between 63 and 47 is ''16" not 17. Had it been "64" instead of 63 the explanation as well as question be correct.

Manoj said: (Sep 11, 2016)  
@Sudheer.

You made a good job, thanks.

Kishore said: (Sep 19, 2016)  
Why it can't 32? It's even and rest are odd.

Ajay said: (Sep 24, 2016)  
You are right @Kishore.

Vikas said: (Sep 28, 2016)  
@Kishore, see that 8 is also an even number.

Anirudh said: (Oct 15, 2016)  
I didn't get this. Please, explain how to solve this?

Prakash said: (Nov 7, 2016)  
In the sequence 32 is the only even number.

Rinik said: (Nov 8, 2016)  
You are right @Sudheer.

Ram said: (Mar 8, 2017)  
It can be 63 because only 63 is a multiple of 9. Rest aren't.

Vivek said: (Mar 8, 2017)  
@Prakash.

See that 8 is also an even number.

Shreyas said: (Sep 4, 2017)  
Well said @Sonutalwani.

Ashok said: (Sep 6, 2017)  
5+8=13
8+13=21
13+21=34
So the odd one is 32.

Pritha said: (May 24, 2018)  
Thank you for explaining the answer.

Divya said: (Jun 22, 2018)  
It's very simple add three number for each last no.

8-13=value is 5.
add 3 in 5,
5+3=8, so 13+=21,
8+3=11 ,so 21+11=32,
11+3=14,so 32+14=46,
14+3=17,so 46+27=63,
17+3=20,so 63+20=83,

So the wrong no is 47, real value is 46.

D.Rakesh said: (Mar 2, 2019)  
13-8 = 5.
21-13 = 8.
32-21 = 11.
x-32 = 14.
63-x = 17.
83-63 = 20.

(5,8,11,14,17,20 ) each time increase by 3.
So there, x should be equal to 46(i.e., x=46).
I hope you understood now.

Shar.P said: (Aug 10, 2019)  
I am not understanding it. Please explain me to get it.

Murugan said: (Nov 4, 2019)  
5, 2, 13, 29, 17, 8, 21 find add man out.

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