11.1. Introduction to Permutations

Try these first

1. 1.

   What is the number of permutations of 2 elements from {A, B, C}?

   Hint

   Think about ordering the selections.

2. 2.

   What defines a combination?

   Hint

   Remember the order doesn't matter.

3. 3.

   What is a permutation?

   • An unordered selection
   • An ordered arrangement
   • None of the above

   Hint

   Think about how selections are rearranged.

4. 4.

   True or False: In combinations, the order of selection matters.

   • True
   • False

   Hint

   Consider how choices are grouped.

5. 5.

   If you have 7 different colored beads, how many ways can you arrange 4 of them in a row?

   Hint

   Use the permutations formula.

6. 6.

   How many ways can you select 5 items out of 10 items where the order does not matter?

   Hint

   Apply the combinations formula accordingly.