Question

Look carefully for the pattern, and then choose which pair of numbers comes next:

8 11 21 15 18 21 22

• A. 25 18
• B. 25 21
• C. 25 29
• D. 24 21
• E. 22 26

Answer 1

The correct option is B 25 21

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.