1.  1 10 7 20 13 30 19
A. 26 40
B. 29 36
C. 40 25
D. 25 31
E. 40 50

Answer: Option C

Explanation:

Here, every other number follows a different pattern. In the first series, 6 is added to each number to arrive at the next. In the second series, 10 is added to each number to arrive at the next.