57, 55, 50, 48, 43, 41, ?	Answers.
A) 30  B) 23  C) 36  D) 25  E) 32
This is a simple alternating subtraction series, with a pattern -2, -5, -2, -5 ....   Answer : 36.
<result>C</result>
57, 55, 50, 48, 43, 41, ?