What is the maximum number of ATM pins that exist Befor we understand how we can know all the possible number of ATM PINs or 4 digit passwords, we need to understand a little bit of probability in the area of permutations and combinations. Permutations are used in statistics to determine the number of ways a set of things can be arranged while combinations are used to determine the number of ways you can choose from a set of things . For instance you can have a set of 10 students, you can use permutation to determine how many ways you can arrange these 10 students taking 5 students at a time ,6 students at a time, etc , but i'll explain that later in this article .Combinations on the other hand are used to determine the number of ways you can choose from a given sample at a time. So at this point you might be wondering the difference between "Choose" and "Arrange". L
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