This simple addition series adds 4 to each number to arrive at the next.

This is an alternating addition and subtraction series, in which the addition of 4 is alternated with the subtraction of 3.

This is an alternating subtraction series, which subtracts 5, then 2, then 5, and so on.

This is an alternating addition series, with a random number, 35, interpolated as every third number. The pattern of addition is to add 2, add 5, add 2, and so on. The number 35 comes after each "add 2" step/

Here, there are two alternating patterns, with every other number following a different pattern. The first pattern begins with 13 and adds 2 to each number to arrive at the next; the alternating pattern begins with 29 and subtracts 3 each time.

In this simple addition with repetition series, each number in the series repeats itself, and then increases by 12 to arrive at the next number.

This is a simple subtraction series, in which 3 is subtracted from each number to arrive at the next.

This is a simple subtraction series, in which 4 is subtracted from each number to arrive at the next.

This is an alternating repetition series. The number 32 alternates with a series in which each number decreases by 2.

This is an alternating addition series with repetition, in which a random number, 66, is interpolated as every third number. The regular series adds 2, then 3, then 2, and so on, with 66 repeated after each "add 2" step.