The door code outside a house often consists of either pressing A or B and then a code with free digits. Suppose you do not know the code, but try your way. How long would it take to test all combinations if each trial takes 10 seconds?
Round to whole hours.

Respuesta :

Answer:

6 hours

Step-by-step explanation:

2 option for letter

10 for each digit

2×10×10×10

2000 trials

2000×10

20,000 seconds

20000/3600

5.5555555556 hours