Question

1. [2 marks] (Q3 from section V of the supplementary notes) A department store has 22...

1. [2 marks] (Q3 from section V of the supplementary notes)

A department store has 22 major departments, only 4 of which can be featured in the next sales flyer. Find the number of ways this can be done if:

  1. Order of appearance in the flyer is not important
  2. Order of appearance is important.
Math   Statistics-And-Probability   
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Answer #1

a. Order of appearance in the flyer is not important

  • Here the order is not important which means any type of way we can arrange which is called Combination
  • The formula is C(n,r)
    • n is the total number of items
    • r is the number of items to select.
    • 22 departments and only 4 has to represent in the next sales flyer
    • Answer is 7315

b. Order of appearance is important.

  • Here the order of the arrangement is important which is called Permutation.
  • The formula is P(n,r)
    • n is the total number of items
    • r is the number of items to select.
    • Answer is 175560
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