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REASONING - NUMBER SERIES



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

 Answer and Solution :  E4
The letters decrease by 1; the numbers are multiplied by 2. 

2. Look at this series: 664, 332, 340, 170, ____, 89, ... What number should fill the blank?

 Answer and Solution : 178This is an alternating division and addition series: First, divide by 2, and then add 8.

3.  Look at this series: V, VIII, XI, XIV, __, XX, ... What number should fill the blank?

 Answer and Solution : XVIIThis is a simple addition series; each number is 3 more than the previous number.  

4. Look at this series: 70, 71, 76, __, 81, 86, 70, 91, ... What number should fill the blank?

 Answer and Solution : 70In this series, 5 is added to the previous number; the number 70 is inserted as every third number.  

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

 Answer and Solution : 14This 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. 


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