Vandermonde's Identity

[@lydieonguene8119]

Thank you sir

[@statisticsmatt]

You're welcome. Many thanks for watching. Don't forget subscribe and let others know about this channel.

[@marciolousada9808]

how to ( k=0 until r) and r=0 (until m+n)

[@statisticsmatt]

i'm not sure if i fully understand your question. for the outer sum, when r=0 the inner sum is k=0. when outer sum is at r=1 then inner sum is k=0 to 1. when outer sum is at r=2 then inner sum is k=0 to 2. etc.

[@kripabibhav2619]

❤❤p❤p

[@statisticsmatt]

Many thanks for watching. Don't forget to subscribe and let others know about this channel.