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Numerical method for radius of convergence.
We need to compute the ordered pairs:
The above generates:
Extrapolate the value in the second column for n = ∞. Looks like we get -.5625.
Here is another one:
This one is a little tougher we must extrapolate to 1 / ∞. So you do a linear fit of the last two points. You get:
The limit of that as x approaches 0 is obviously .2498259
Which is close to the the exact answer of 2.
In mathematics, you don't understand things. You just get used to them.
Probability is the most important concept in modern science, especially as nobody has the slightest notion what it means.
90% of mathematicians do not understand 90% of currently published mathematics.