- #1
jetsetjoe
- 5
- 0
Homework Statement
Find the radius of converge of:
[tex]\sum[/tex]x[tex]^{}(n choose k)[/tex]
Homework Equations
Radius of converge = 1/limsup|an+1/an|, for power series: anx^n
The Attempt at a Solution
Tried rewriting (n choose k) as: n!/[k!(n-k)!]
but where do I go from here? How do I take out x^n?