Number Series - Verbal and Reasoning

Directions to SolveLook carefully for the pattern, and then choose which pair of numbers comes next.
Q1:

Look at this series: 70, 71, 76, __, 81, 86, 70, 91, ... What number should fill the blank?

A 70

B 71

C 80

D 96

ANS:A - 70

In this series, 5 is added to the previous number; the number 70 is inserted as every third number.