AMC / AIME · Combinations · Easy
Combinations: How many pairs can be formed from math people?
Unordered selections.
Try the problem
How many pairs can be formed from people?
Hint and answer
Concept to use
$\binom nk$.
Hint
Selections ignore order: use .
Answer
36
More Combinations problems
Practice more with the free Combinations worksheet generator, or browse the full problem library.