Question

Which term of tge sequence 2,1,1/2,1/4,....... Is 1/128?

Answer 1

FORMULA:   tn=a*rn-1

where, a=initial term=2

n=nth term

r=common ratio=1/2

1/128=2*(1/256)=2*(1/2)8=2*(1/2)n-1

Hence,n-1=8; …........n=9th term