Question 1.


    By the definition,  n! = 1 * 2 * 3 * 4 * . . . * n.


    So,  4! = 1*2*3*4.


    You can compute it on your own.




Question 2.


         = 


    this product 1*2*3*4*5 is in the numerator and in the denominator.


    So we can cancel it in the numerator and in the denominator.


    You will get then


         = ,


    which is just much easier to calculate.


    So,  --YOU-- calculate it by hand OR using your calculator.