Permutations deal with arrangements, and combinations deal with selections. Understanding the difference between the two is crucial. Formulas and Notations Familiarise yourself with the basic ...

The differences in behavior between the simplest robot and ... organic world is the result of innumerable different combinations and permutations of relatively few factors.” ...

Safe combinations are permutations because the order of the numbers matters to open the safe. An anagram where different words come from the same root word is another example. Order matters ...