Question

Calcule os numeros
A,(3!/2!)
B,(4!/2!)
C,(4!/3!)
D,5!/2!)
E,(5!/3!)
F,(5!/4!)

Answer 1

A)
(3!/2!)

3.2!    =  3
-------
  2!

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
B)
(4!/2!)

4.3.2!    = 4.3 =  12
---------
   2!

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
C)
(4!/3!)

4.3!    = 4
------
   3!


¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
D)
(5!/2!)

5.4.3.2!       =  20.3  =  60
--------------
    2!

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨ 
E)
(5!/3!)

5.4.3!       =  20
------------
    3!


¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
F)(5!/4!)

5.4!    =  5
-------
   4!