Find the odd man out
1, 3, 7, 11, 15, 18, 21	Pick one:	A) 3	B) 7	C) 18	D) 21	E) 1
The 18 is the only even number in the series.   ANSWER:18
<result>C</result>
Find the odd man out
1, 3, 7, 11, 15, 18, 21