53, 53, 40, 40, 27, 27, ? Choose the correct answer:
A) 14	B) 12	C) 16	D) 18	E) 20
First, each number is repeated, then 13 is subtracted to arrive at the next number.   14nswer : 14.
<result>A</result>
53, 53, 40, 40, 27, 27, ?