Question

What is the value of r of the geometric series n=11.3(0.8)n-1

Answer 1

the value of r of the geometric series n=11.3(0.8)n-1

$an=11.3(0.8)^{n-1}$

General formula for nth term of any geometric series is   $a_n=a_1(r)^{n-1}$

Here 'r' is the common ratio

a_1 is the first term of the series

Now we compare the given formula with general formula

Compare  $an=11.3(0.8)^{n-1}$  with  $a_n=a_1(r)^{n-1}$

The value of r= 0.8