1.  75 65 85 55 45 85 35
A. 25 15
B. 25 85
C. 35 25
D. 85 35
E. 25 75

Answer: Option B

Explanation:

This is a simple subtraction series in which a random number, 85, is interpolated as every third number. In the subtraction series, 10 is subtracted from each number to arrive at the next.