How many possibilities are there for a 3 pin lock on a suitcase?
By comparison, this 3-dial lock (three wheels, each with digits 0-9) has 10 × 10 × 10 = 1, 000 possible combinations.
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However there are (0-9) 10 possibilities for each of the three digits. Therefore, the maximum possible number of codes is 10* 10*10 = 1000. So, anywhere from 1 to 1,000.
Using a suitcase lock makes it more difficult for baggage handlers or strangers to riffle through your goods at the airport. Not to mention, luggage locks are a great way to ensure your personal belongings won't fall out because the zippers are held together.
No, you are not required to have a TSA approved luggage lock on your bag to fly. You can use any luggage lock you want but if your lock is not TSA approved, then if the TSA does search your luggage, they have the right to cut off your non-approved TSA lock because they do not have a key to open it.