Verified Answer :

BrandonErickson98

I believe 5 different ways. The options being two packs of 9-one pack of 9 and 3 packs of 3- 1 pack of 9, 2 packs of 3 and 3 singles- one pack of 9, one pack of 3, and 6 singles- and then one pack of 9 and 9 singles.
Hope this helped!

There are 12 ways you can buy cookie if cookies are sold singly or in packages of 3 or 9.

What is permutation and combination?

A permutation is the number of different ways a set can be organized; order matters in permutations, but not in combinations.

As we have:

Cookies are sold singly or in packages of 3 or 9.

So the total ways you buy the cookie such that total cookie you buy is 18:

  • Two - 9
  • One - 9, Three-3
  • One 9, Two 3, 3 single
  • One 9, one 3, 6 single
  • One 9, 9 single
  • Six 3
  • Five 3, 3 single
  • Four 3, 6 single
  • Three 3, 9 single
  • Two 3, 12 single
  • One 3, 15 single
  • All 1(18 single)

Thus, there are 12 ways you can buy cookie if cookies are sold singly or in packages of 3 or 9.

Learn more about permutation and combination here:

https://brainly.com/question/2295036

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