loader image
Skip to main content
If you continue browsing this website, you agree to our policies:
Continue
x
Home

Permutations and Combinations

Completion requirements

This section introduces formulas for combinations and permutations, which are helpful in computing probabilities.


  1. Order counts in permutations. For combinations, only the final result matters, not how you get to it. Order does not count for combinations.

  2. This is asking for combinations with 5 items (types of toppings) taken 2 at a time. 5!/(3! \times 2!) =120/12 = 10.

  3.  Since these are independent events you apply the multiplication rule: (.5 x .1667 = .0833)

  4. This is asking for permutations with 5 items (entries) taken 2 at a time (first place and second place). 5!/(3!) =120/6 = 20.
Prev Section
Next Activity