Lesson Worksheet: Counting With Repetition Where Order Does Not Matter Mathematics

In this worksheet, we will learn how to use combinations to count with repetition where order does not matter.

Q1:

A magician wants to hide 4 identical balls in 16 boxes. More than one ball can be placed in a box. In how many ways can the balls be hidden?

Q2:

Twenty passengers get on an airport shuttle. The shuttle route includes six hotels, and each passenger gets off the shuttle at his/her hotel. The driver records how many passengers leave the shuttle at each hotel. How many different possibilities exist?

Q3:

How many integer solutions are there for the equation 𝑥+𝑥+𝑥=30, given that 𝑥>5, 𝑥4, and 𝑥>3?

Q4:

How many possible diagonals can be drawn in a regular 𝑛-gon?

  • A𝑛(𝑛3)2
  • B𝑛(𝑛1)2
  • C𝑛(𝑛1)
  • D𝑛2
  • E𝑛(𝑛3)

Q5:

Three friends are in a tapas restaurant. They would like to order 6 dishes to share. There are 15 different options on the menu. Given that they can choose multiple dishes of the same type, how many different possible ways can they order 6 dishes to share?

Q6:

How many nonnegative integer solutions are there to the equation 𝑥+𝑥+𝑥+𝑥+𝑥=40?

Q7:

Mia is buying an ice cream cone and is able to pick two scoops from four flavors: chocolate, banana, strawberry, and vanilla. How many different ways can she pick two scoops from the four flavors?

Q8:

A boy is asked to select two flags for football clubs out of 4 different flags. In how many ways can such a selection be made if he can choose the same flag twice and the order of the two flags is not important?

Q9:

If you need to distribute 5 identical chocolate bars among 3 girls such that each girl takes at least one, in how many ways can you distribute the chocolate bars?

Q10:

You need to select three letters. The letters will be selected from a set of 4 letters. Repetition of letters is allowed and the order is not important.

How many such selections can be made?

  • A4 selections
  • B12 selections
  • C24 selections
  • D20 selections
  • E3 selections

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