[tex] \large\underline \bold{{SOLUTION}}[/tex]
Using the permutation formula
[tex]\longmapsto\rm{P_n= n!}[/tex]
[tex]\longmapsto\rm{P_6= 6!}[/tex]
[tex]\longmapsto\rm{P_6= 6×5×4×3×2×1}[/tex]
[tex]\longmapsto \boxed{\rm{P_6=720}}[/tex]
[tex] \large\underline{ \bold{ANSWER}}[/tex]