If the sum of n terms of two A.P.’s are in the ratio (3n + 2) : (2n + 3), find the ratio of their 12th terms.

Here,



_____(1)


Now,we want to find ratio of 12th term,


i.e.


___(2)


From (1) and (2)we get n-1=22


i.e.n=23




1