Logical Reasoning - Number Series - Discussion

Find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters

5. 

Look at this series: 8, 43, 11, 41, __, 39, 17, ... What number should fill in the blank?

[A]. 8
[B]. 14
[C]. 43
[D]. 44

Answer: Option B

Explanation:

This is a simple alternating addition and subtraction series. The first series begins with 8 and adds 3; the second begins with 43 and subtracts 2.

Piya said: (Aug 11, 2012)  
Dear friends look carefully.

Split it.

As we can see here given data 8, 43, 11, 41, __, 39, 17.

Take alternate nos.

Then we get.

8, 11, 14, 17.. So on by adding 3 to previous no.

&.

43, 41, 39, 37.. So on by subtracting 2 from previous no.

I hope you guys got it.

Best of luck. :).

Sumit said: (Sep 13, 2016)  
Good explanation @Piya.

Samart said: (Dec 28, 2016)  
Nice explanation @Piya.

Manfool said: (Jun 27, 2017)  
Thanks for the explanation.

Surya said: (Apr 29, 2018)  
Very nice explanation. Thanks.

Fairy said: (Apr 30, 2018)  
Thank you for explaining it @Piya.

P. Harshavardhini said: (Jun 18, 2018)  
Thanks @Priya.

Rishi said: (Sep 27, 2018)  
Thanks for the explanation.

Raj Nayak said: (Sep 29, 2018)  
14 is the correct answer.

Suresh Kenganvaur said: (Nov 18, 2018)  
Super and useful explanation. Thanks all.

Fardeen Abbasi said: (May 18, 2020)  
Thanks for explaining @Piya.

Vibooshni said: (Mar 2, 2021)  
Clear explanation, thanks @Priya.

Sanamdeep Singh said: (Aug 31, 2021)  
@ALL.

Split it into two equation:

8,11,14,17 --->addition of 3.
43,41,39 ---> subtraction of 2.

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