Question

If Sn=2^n-1

what's the expression of
Sn-1?​

Answer 1

Answer:

$S(n-1)=2^{n-2}$

Step-by-step explanation:

Given that,

The value of $S_n=2^{n-1}$

We need to find an expression for $S(n-1)$. To find it, put the value of n as (n-1). So,

$S_{n-1}=2^{n-1-1}\\\\=2^{n-2}$

Hence, the value of S(n-1) is equal to $2^{n-2}$.