Skill 8 of 9 · GeometryClose

Counting techniques

Use counting techniques to solve math problems, such as counting how many ways objects can be ordered, arranged, or combined.

  • When order does not matter, count combinations: n(n − 1) ÷ 2 for choosing 2 from n.
  • When order matters, multiply the choices for each position.

Question 1 of 4

A restaurant serves custom omelets. There are 6 vegetables available, and guests may select any 2 vegetables. How many different combinations of 2 vegetables are possible?

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