You can simply multiply 10*10 to get 100 possible combinations for the first two digits. Then you can multiply it again by 10 to get 1000 combinations for the first 3 digits. Then multiply it again by 10 to see that there are 10,000 possible combinations for a 4 digit code with 10 number, which is how pin numbers are created. This also means that you might have the same pin number as somebody else!
Hope this helped, please mark brainliest i need to feed my family ^_^
