(i) left( begin{array}{c} n 0 end{array}right) = left( begin{array}{c} n n end{array}right) = 1 (ii) left( begin{array}{c} n k end{array}right) = left( begin{array}{c} n n-k end{array}right) (iii) Gefunden auf https://mo.mathematik.uni-stuttgart.de/inhalt/aussage/aussage81/