which of the following recursive sequences has the first four terms:a1=27,a2=9,a3=3,a4=1?

Question

a.)an=an-1 2-1,a1=2:n>=1 b.)an=an-1 2+1,a1=2:n>=1 c.)an=3/an-1,a1=27,n>=1 d.)an=an-1/3 a1=27,n>=1 help ASAP

Answer 1

a_n+1 = a_n / 3

 

3(a_n-1) = a_n

 

C).