Look at this series: 3, 4, 7, 8, 11, 12, ... What number should come next?	Answers:
A) 15  B) 14  C) 17  D) 12  E) 19
This alternating addition series begins with 3; then 1 is added to give 4; then 3 is added to give 7; then 1 is added, and so on.   15NSWER 15
<result>A</result>
Look at this series: 3, 4, 7, 8, 11, 12, ... What number should come next?