Apr
29
awarded Supporter
Apr
29
accepted Combinatorial argument for $\sum_{k=0}^n k^2 \binom{n}{k} = n(n+1)2^{n-2}$
Apr
29
comment Combinatorial argument for $\sum_{k=0}^n k^2 \binom{n}{k} = n(n+1)2^{n-2}$
Thank you so much.
Apr
29
comment Combinatorial argument for $\sum_{k=0}^n k^2 \binom{n}{k} = n(n+1)2^{n-2}$
This is very beautiful. Thanks a lot.
Apr
29
asked Combinatorial argument for $\sum_{k=0}^n k^2 \binom{n}{k} = n(n+1)2^{n-2}$
Apr
19
comment Generating random variables from coin tosses.
Thanks for your answer.
Apr
19
awarded Scholar
Apr
19
accepted Generating random variables from coin tosses.
Apr
18
awarded Student
Apr
18
asked Generating random variables from coin tosses.