A marble collector

Zara has a collection of 4 marbles: an Aggie, a Bumblebee, a Steelie, and a Tiger. She wants to display them in a row on a shelf, but does not want to put the Steelie and the Tiger next to one another. In how many ways can she do this?

  • A: 6
  • B: 8
  • C: 12
  • D: 18
  • E: 24
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