Look at this series: 70, 71, 76, 70, 81, __, 70, 91, ... What number should fill the blank? Answers.
A) 70	B) 86	C) 82	D) 77	E) 52
86   86   In this series, 5 is added to the previous number; the number 70 is inserted as every third number.
<result>B</result>
Look at this series: 70, 71, 76, 70, 81, __, 70, 91, ... What number should fill the blank?