What number should replace the question mark? 11, 15, 16, 12, 21, 9, ---? Choose the correct choice:
A) 21	B) 29	C) 28	D) 27	E) 26
Answer: 26   11, 15, 16, 12, 21, 9, ---?   There are two alternate sequences: +5 and -3.
<result>E</result>
What number should replace the question mark? 11, 15, 16, 12, 21, 9, ---?