Solution: Based on classical concepts , the principle of addition and the principle of multiplication .

　　Method 1　Records the event 

the -th test ticket was not drawn to ,

At least one test ticket was not drawn as ,

Then 

,

But is not an incompatible event , so the addition formula using the properties of probability is:

　　From the problem, we know that 

,

,

,

So 

.

　　Method 2　Considers the opposite event of Because all three cards draw , and it is easy to know that

.

Therefore, using the properties of probability 3

.