Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next? Select the correct option.
A) 7	B) 10	C) 12	D) 13	E) 20
This is a simple alternating addition and subtraction series. In the first pattern, 3 is added; in the second, 2 is subtracted.   12-2= 
<gadget id="calculator">12-2</gadget>
<output>10</output>
10   Option 10
<result>B</result>
Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?