In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much

Answer: Option D

Explanation:

8 x 1 - 2 = 6 6 x 2 - 3 = 9 9 x 3 - 4 = 23 23 x 4 - 5 = 87 87 x 5 - 6 = 429 ...

In this simple subtraction series, each number decreases by 0.4.

Answer: Option C

This is a simple multiplication series. Each number is 3 times more than the previous number.

Answer: Option A

This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.

This is a simple subtraction series. Each number is 35 less than the previous number.