Simplify (5(2x^2 y^3 )^2)/(2x^3 y^4 )^3. Show your work. Give an exact answer, not a decimal approximation

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible