Answer:
-800
Step-by-step explanation:
First term, B(1) = -500
nth term, b(n) = b(n - 1) 4/5
comparing with the arithmetic progression equation
T(n) = a(n - 1)d
a = b(1) = b
d = 4/5
Third term = b(3)
n = 3
b(3) = -500( 3 - 1) * 4/5
b(3) = -500(2)*4/5
b(3) = -800
