The 7th term in the given geometric progression sequence is -3125.
As per the formula of geometric progression,
Tₙ = arⁿ- 1 ----------------- (1)
where Tₙ = nth terms of the given GP sequence.
a = first term of the sequence.
r = Common ratio of the given GP.
n = the term number.
so by putting value of a = -1/5 , r = 5 (as -25/-5 = 5) in eq (1) , we get
T₇ = (-1÷5)×5⁶⁻¹ = -3125