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Which count does it need

Exercise and reference answers

Items
  1. Item
    Lock digit order
    Category
    Permutation
  2. Item
    Letters of ROOT
    Category
    Permutation
  3. Item
    Seating in a row
    Category
    Permutation
  4. Item
    A team of two
    Category
    Combination
  5. Item
    Handshake pairs
    Category
    Combination
  6. Item
    Choosing 3 girls
    Category
    Combination
Categories
  1. Item
    Permutation
  2. Item
    Combination
Instructions
Tap each situation into the kind of count it needs.

Explanation

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