Exercise :: Number Series  Type 2
 Number Series  Type 1
 Number Series  Type 2
 Number Series  Type 3
 Number Series  Type 4
Look carefully for the pattern, and then choose which pair of numbers comes next.
1.  28 25 5 21 18 5 14 

Answer: Option A Explanation: 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.

2.  8 11 21 15 18 21 22 

Answer: Option B Explanation: 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.

3.  9 16 23 30 37 44 51 

Answer: Option D Explanation: Here is a simple addition series, which begins with 9 and adds 7.

4.  2 8 14 20 26 32 38 

Answer: Option B Explanation: This is a simple addition series, which begins with 2 and adds 6.

5.  9 11 33 13 15 33 17 

Answer: Option A Explanation: 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.
