Directions: Look carefully for the pattern, and then choose which pair of numbers comes next.
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.
Directions: Look carefully for the pattern, and then choose which pair of numbers comes next.
Explanation:
Here is a simple addition series, which begins with 9 and adds 7.
Directions: Look carefully for the pattern, and then choose which pair of numbers comes next.
Explanation:
This is a simple addition series, which begins with 2 and adds 6.
Directions: Look carefully for the pattern, and then choose which pair of numbers comes next.
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.
Directions: Look carefully for the pattern, and then choose which pair of numbers comes next.
Explanation:
This is an alternating addition series with a random number, 4, interpolated as every third number. In the main series, 1 is added, then 2 is added, then 1, then 2, and so on.