Answer:
15th term will be

Explanation:
In a geometric progression we know any term of the series is represented as

where a = first term, r = common ratio, and n = number of term
Now as per question 4th term is -25 then as pr formula
------(1)
Now the ninth term is 25/32
-----(2)
Now we put the value of a from equation 1 to equation 2



therefore a =



Therefore 15th term will be
