Question

How do you write the formula for the nth term given 1.2, 2.4, 4.8, 9.6,...?

Answer 1

`0.6xx2^n`

Explanation:

The series is in GP
Its 1st term `a= 1.2`
Its common ratio `r=2.4/12=3.8/2.4=9.6/4.8=...=2`
We know the nthter of GP is
`t_n=a*r^(n-1)=1.2xx2^(n-1)=0.6xx2^n`