csat-suneung 2019 Q22

csat-suneung · South-Korea · csat__math-science 3 marks Permutations & Arrangements Factorial and Combinatorial Expression Simplification

Find the value of ${}_{6}\mathrm{P}_{2} - {}_{6}\mathrm{C}_{2}$. [3 points]

Find the value of ${}_{6}\mathrm{P}_{2} - {}_{6}\mathrm{C}_{2}$. [3 points]