5^(3n+2) *2^(3n+1) * 1/1000^(n) = 5^(3n+2) * 2^(3n+2-1) *1000^(-n) = 10^(3n+2) * 1000^(-n) *1/2 = 10^(3n+2) * 10^(-3n) * 1/2 = 10^2 *1/2 = 100/2 = 50
5^(3n+2) *2^(3n+1) * 1/1000^(n) = 5^(3n+2) * 2^(3n+2-1) *1000^(-n) = 10^(3n+2) * 1000^(-n) *1/2 = 10^(3n+2) * 10^(-3n) * 1/2 = 10^2 *1/2 = 100/2 = 50