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

1. 

Look at this series: F2, __, D8, C16, B32, ... What number should fill the blank?

[A]. A16
[B]. G4
[C]. E4
[D]. E3

Answer: Option C

Explanation:

The letters decrease by 1; the numbers are multiplied by 2.

Vinod said: (Jul 6, 2011)  
(from the backwards) letters are in reverse order, and numbers are divided by 2.

Sridhar Pradhani said: (Aug 25, 2011)  
Yes, letters are in reverse from right to left and numbers are multiplyed by 2 from left to right.

Tamil said: (Mar 31, 2012)  
First number is 2 after one space then each number multiply 2, next letter are arrange backward after get answer.

Yamini said: (Sep 27, 2012)  
Letters are decreasing order (from left to right) and numbers are divided by 2 (from right to left).

Rashmi said: (Sep 27, 2014)  
Letter are in reverse order and numbers are divided by 2.

Sanjay said: (Oct 26, 2014)  
Letters are decreasing by one place, at the same time the numbers are increasing by multiplication of 2 to previous number.

Priyanka Rout said: (Dec 31, 2014)  
B, C, D, E, F.
F, E, D, C, B.

2*1 = 2.
2*2 = 4.
4*2 = 8.
8*2 = 16.
16*2 = 32.

Sushree said: (Nov 16, 2017)  
Thank you @Priyanka Ji.

Kanika said: (May 16, 2018)  
B, C, D, E, F.
F, E, D, C, B.
F2, E4, D8, C16, B32.

2*2 = 4,
2*4 = 8,
2*8 = 16,
2*16 = 32.

Jyothi Reddy said: (Aug 10, 2018)  
Thanks for explaining the answer.

Biju said: (Aug 24, 2018)  
How come 4?

Hannah said: (Jun 15, 2020)  
Seeing the pattern here does not require you looking at the letters just the numbers will do. 2,_, 8, 16, 32. The answer would be 4 because all of these numbers are multiples of 2. 8x2= 16, 16x2= 32 so, 2x2= 4.


Looking at the pattern with the numbers is way easier the other letters might throw you off. I will explain the lettering, each letter decreases by 1, F, _, D, C, B. They are all going down one. A, B, C, D, E, F!

E is before the F and after D, so the final answer would be E4.

Sanamdep Singh said: (Aug 31, 2021)  
@Biju.

Because they all are multiples of 2, here, in this series, only 4 is missing.

So it will be E4.

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