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: 72, 76, 73, 77, 74, __, 75, ... What number should fill the blank?

A 70

B 71

C 75

D 78

ANS:D - 78

This series alternates the addition of 4 with the subtraction of 3.