Question

is it right

Answer 1

yes but it hurt my eyes
too too much work

Answer 2

hahaha what is the shortest way to do it

Answer 3

\[_{18}C_{12}=_{18}C_{6}=\frac{\overbrace{18\times 17\times 16\times 15\times 14\times 13}^{\text{six terms}}}{6!}\]