Question

find the sum of the inite geometric series by using the formla for S^n
1-1/4+1/16-1/64+1/256
the sum of the finite geometri series is

Answer 1

The formula is\[s=\frac{a _{1}}{1-r}\]where r=-1/4 and a1=1 so \[s=\frac{1}{1-(-1/4)}=\frac{1}{5/4}=\frac{4}{5}\]or in decimal form 0.8 is the sum

Answer 2

btw, I don't; understand the reference to the formula S^n, but this is the usual formula