Question 319360
10 things, Position 4

   10P4 = {{{(10*9*8*7)/(4*3*2*1)}}} = {{{(10*9*cross(8)*7)/(cross(4)*3*cross(2)*1)}}} = {{{(10*9*7)/3}}} = {{{(10*""^3*cross(9)*7)/cross(3)}}} = {{{10*3*7=210}}}