Let's see how many ways 4 digits can add up to 28. We start with the highest digit 9 and subtract it from 28: 28-9=19.. You know, a "combination lock" should really be called a "permutation lock". The order you put the numbers in matters. Easy Permutations and Combinations. A.... Now, this enormous number was not found by counting them. It is derived theoretically from ... In how many different ways could you arrange them? Answer. 5! 538a28228e narmar
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