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Constant difference, or constant ratio?

Exercise and reference answers

Items
  1. Item
    3, 7, 11, 15
    Category
    Constant difference
  2. Item
    Each term adds a fixed amount
    Category
    Constant difference
  3. Item
    5, 10, 15, 20
    Category
    Constant difference
  4. Item
    2, 6, 18, 54
    Category
    Constant ratio
  5. Item
    Each term multiplies by a fixed amount
    Category
    Constant ratio
  6. Item
    3, 9, 27, 81
    Category
    Constant ratio
Categories
  1. Item
    Constant difference
  2. Item
    Constant ratio

Explanation

Adding the same amount each time is one pattern multiplying by the same amount is another. Telling them apart is the first move. Source: syllabus Maths, Ch 9 Sequences and Series.
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