A sequence ana_nan has Sn=5(2n−1)S_n = 5(2^n-1)Sn=5(2n−1). Find ana_nan.
5⋅2n−15 \cdot 2^{n-1}5⋅2n−1
2n2^n2n
10⋅2n−110 \cdot 2^{n-1}10⋅2n−1
5⋅2n5 \cdot 2^n5⋅2n