Question Number 34594 by abdo mathsup 649 cc last updated on 08/May/18
$${prove}\:{that}\:\:\sum_{{k}=\mathrm{0}} ^{{p}} \left(−\mathrm{1}\right)^{{k}} \:{C}_{{n}} ^{{k}} \:\:=\left(−\mathrm{1}\right)^{{p}} \:{C}_{{n}−\mathrm{1}} ^{{p}} \\ $$
prove-that-k-0-p-1-k-C-n-k-1-p-C-n-1-p-