The sum of n terms of two arithmetic progressions are in the ratio (2n + 3):(7n + 5). Find the ratio of their 9th terms.

The sum of n terms of two arithmetic progressions are in the ratio (2n

1.	The sum of n terms of two arithmetic progressions are in the ratio (2n + 3):(7n + 5). Find the ratio of their 9th terms.
A.	4:5
B.	5:4
C.	9:31
D.	31:9
Answer» D. 31:9