cant find the ratio
Geometric series has a=4 and r of 0<r<1.
The first, second and fourth term of this series form an arithmetic series.
Find the sum to infinity.
Here is what I've done so far....
4-4r=4r-4r^3
r^3-2r+1=0
r= 0,1,-1.
But all of these ratios don't fit the initial constraint.
Can I have some hints please (no solutions)
The first, second and fourth term of this series form an arithmetic series.
Find the sum to infinity.
Here is what I've done so far....
4-4r=4r-4r^3
r^3-2r+1=0
r= 0,1,-1.
But all of these ratios don't fit the initial constraint.
Can I have some hints please (no solutions)
(edited 7 years ago)
never mind, managed to do it.
how do i delete my post?
how do i delete my post?
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