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Which quantity is which?

Exercise and reference answers

Items
  1. Item
    l
    Category
    A number
  2. Item
    θ
    Category
    A number
  3. Item
    a
    Category
    A vector
  4. Item
    b
    Category
    A vector
  5. Item
    r = a + λb
    Category
    An equation
  6. Item
    l² + m² + n² = 1
    Category
    An equation
Categories
  1. Item
    A number
  2. Item
    A vector
  3. Item
    An equation

Explanation

Sorting the chapter's objects by what they actually are. Source: syllabus Maths Part II, Ch 11 Three Dimensional Geometry.
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