Finding Coefficient in an expansion| Generating Functions

[@user-of9ug7or1t]

Your voice is so sweet and very clear.

[@MathPod]

Thanks

[@burbaki]

Really good lectures. Thank you.

[@jaeimp]

Thank you for sharing these presentations. They are very useful. Small oversight, perhaps, @6:35 it should be ^6 after the right parenthesis, shouldn't it?

[@Subhajit_Paul123]

That (n+r-1) choose r is just the star and bar formula