36 31 29 24 22 17 15

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

This is a simple alternating addition and subtraction series. First, 3 is added, then 1 is subtracted, then 3 is added, 1 subtracted, and so on.

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.

This is a simple subtraction series in which a random number, 85, is interpolated as every third number. In the subtraction series, 10 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.

The wing, fin, and rudder are all parts of an airplane.

Unique, rare, and exceptional are all synonyms. Beautiful has a different meaning.

In this series, the letters progress by 2, and the numbers increase by 2.

To drizzle is to rain slowly; to jog is to run slowly.

This is an alternating addition and subtraction series. In the first pattern, 2 is added to each number to arrive at the next; in the alternate pattern, 6 is subtracted from each number to arrive at the next.