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Types of Sequences

Different sequences follow different rules.
Arithmetic: 3, 5, 7, 9,... (add 2 each time)
Geometric: 2, 4, 8, 16,... (×2 each time)
Square numbers: 1, 4, 9, 16,...
Triangular numbers: 1, 3, 6, 10,... (add 2, then 3, then 4...)
 Number
  Algebra
  Ratio & Proportion
  Geometry
  Probability
  Statistics