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⁞ Number Series

Reasoning ➤ Number Series ➤ 2
Question 1
Q1.     28   25   5   21   18   5   14 .. which pair of numbers will come next ?
 

Answer :  11    5


This is an alternating subtraction series with the interpolation of a random number, 5, as every third number. In the subtraction series, 3 is subtracted, then 4, then 3, and so on.
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Question 2
Q2.     8   11   21   15   18   21   22 .. which pair of numbers will come next ?
 

Answer :  25    18


This is an alternating addition series, with a random number, 21, interpolated as every third number. The addition series alternates between adding 3 and adding 4. The number 21 appears after each number arrived at by adding 3.
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Question 3
Q3.     9   16   23   30   37   44   51 .. which pair of numbers will come next ?
 

Answer :  58    65


It is a simple addition series, which begins with 9 and adds 7.
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Question 4
Q4.     9   11   33   13   15   33   17 .. which pair of numbers will come next ?
 

Answer :  19    33


In this alternating repetition series, a random number, 33, is interpolated every third number into a simple addition series, in which each number increases by 2.
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Question 5
Q5.     2   8   14   20   26   32   38 .. which pair of numbers will come next ?
 

Answer :  44    50


This is a simple addition series, which begins with 2 and adds 6.
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