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Projective Geometry/Classic/Projective Transformations/Transformations of projective 3-space/Permutation

< Projective Geometry | Classic/Projective Transformations | Transformations of projective 3-space
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Many counting problem can be solved by permutation.

permutation-

A permutation of a set distinct objects in an ordered arrangement of these object.

combination is also for counting unordered selection of object.

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