Respuesta :

tramserran

Answer:  45,697,600

Step-by-step explanation:

There are 26 letters in the alphabet and numerals to choose from.  There is nothing that says that letters and numbers cannot be repreated. So,

   X  X  X  X  - Y  Y

= 26·26·26·26·10·10

= 26⁴(10)²

= 45,697,600