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
Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?  Choose the correct choice: A) 1/8 B) 1/4 C) 2/5 D) 2/7 E) 1/1
A   1/8   This is a simple division series; each number is one-half of the previous number. In other terms to say, the number is divided by 2 successively to get the next result.   4/2= 
<gadget id="calculator">4/2</gadget>
<output>2</output>
2   2/2= 
<gadget id="calculator">2/2</gadget>
<output>1</output>
1   1/2= 1/2   (1/2)/2 = 1/4   (1/4)/2 = 1/8 and so on.
<result>A</result>
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
Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?