Permutation Equations

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    Equations of permutation - this basically refers to the topic of permutation, placement and combination, although for myself personally I can not understand the difference between placement and combination. I see that the formulas are different, I can substitute, but the difference, if you can write so "do not feel". For example, if the displacement - the product of all the selected objects that are not equal to each other (different), but with the other two is not clear what exactly we count. I will not be original, if I say that in such cases, I ask the site https://writemypapers4me.net/ help write my paper and expect execution from people who know this much better than me. Unfortunately I can not do anything about it yet, it seems that mathematics is not a science for me.