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Spot the odd one out

Exercise and reference answers

Questions
  1. Items
    1. Constant
    2. Direct
    3. Inverse
    4. Ratio
    Odd item
    Constant
  2. Items
    1. One up one down
    2. Rises together
    3. Falls together
    Odd item
    One up one down
  3. Items
    1. x/y
    2. xy
    3. x₁/y₁
    Odd item
    xy

Explanation

One per definition. Source: syllabus Maths, Ch 11 Direct and Inverse Proportions.
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