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How to find nPr (permutations) efficiently? - Stack Overflow 4 How about this: nPr = (n−1)Pr + (n−1)P (r−1) ⋅ r Rationale: nPr denotes the number of ways to choose r elements from n while noting their order and not putting them back In the above recursion I distinguish two cases Either you don't choose the n th element, in which case you'll be choosing all your r elements from a set of (n−1)
What are all of the Maven Command Line Options? - Stack Overflow I'm looking for the list of options for Maven 2 2 but cannot find it If someone knows the location please post it Thank you I found the following but I don't know enough of Maven to know which a
Buried School Bus = Storm Shelter - Survivalist Forum So, was listening to NPR today (it happens), and they had an interview with an Alabama man who'd survived the storms that tore through his town and property, he and his family, by taking shelter in a surplus school bus he'd previously buried in a hillside After the storms of '94 he'd realized
counting combinations and permutations efficiently I have some code to count permutations and combinations, and I'm trying to make it work better for large numbers I've found a better algorithm for permutations that avoids large intermediate resu