Question

Find an explicit formula (in terms of n$ϵ$ N)for $f\left(n\right)=(n-1)+2n-1$

Answer 1

$f\left(n\right)=(n-1)+2n-1$

$f\left(n\right)=n+2n-1-1$

$f\left(n\right)=3n-2$

$f\left(n\right)=-2+3n$

where $n\in N$