### Possible Answer

The number of k-combinations for all k is the number of subsets of a set of n elements. There are several ways to see that this number is 2 n. In terms of ... - read more

There are 10,000 possible combinations that the digits 0-9 can be arranged to form a 4-digit pin code. Out of these ten thousand codes, which is the least commonly used? - read more

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