$\binom{\it{20}}{\it{19}}+ \binom{\it{19}}{\it{16}}+ \binom{\it{16}}{\it{14}}+ \binom{\it{14}}{\it{12}}+ \binom{\it{12}}{\it{7}}+ \binom{\it{7}}{\it{6}}+ \binom{\it{6}}{\it{5}}+ \binom{\it{5}}{\it{3}}+ \binom{\it{3}}{\it{1}}+ \binom{\it{1}}{\it{0}}= \it{2019}$
$\binom{\it{20}}{\it{19}}+ \binom{\it{19}}{\it{17}}+ \binom{\it{17}}{\it{14}}+ \binom{\it{14}}{\it{10}}+ \binom{\it{10}}{\it{7}}+ \binom{\it{7}}{\it{6}}+ \binom{\it{6}}{\it{5}}+ \binom{\it{5}}{\it{3}}+ \binom{\it{3}}{\it{1}}+ \binom{\it{1}}{\it{0}}= \it{2019}$