Given A1 = 1, a (n + 1) / a (n) = 1 / 2 in the sequence, find the general term formula of the sequence

Given A1 = 1, a (n + 1) / a (n) = 1 / 2 in the sequence, find the general term formula of the sequence

a(n+1)/a(n)=1/2
q=1/2
an=1*(1/2)^(n-1)
=(1/2)^(n-1)