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Permutation and combination

Exercise and reference answers

Left
Permutation
Items
  1. Region
    Permutation
    Item
    Order is kept
  2. Region
    Permutation
    Item
    XY differs YX
  3. Region
    Combination
    Item
    Order dropped
  4. Region
    Combination
    Item
    XY equals YX
  5. Region
    both
    Item
    Takes r from n
  6. Region
    both
    Item
    Uses factorials
Right
Combination
Instructions
Drop each property into its count, or into the overlap.

Explanation

_Source: syllabus Mathematics, Ch 6 'Permutations and Combinations'_
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