Multiple Choice Question (MCQ)

Sarah is scheduling the first periods of her school day. She needs to fill those periods with calculus, art, literature, and physics, and eachof these courses is offered during each of the first four periods. How may different schedules can Sarah choose from?

  1. ×

    1

  2. ×

    4

  3. ×

    12

  4. ✓

    24

  5. ×

    120

Collected in the board: Factorial

Steven Zheng posted 3 years ago

Answer

  1. Sarah can fill her first-period slot with any of the 4 subjects, leaving 3 for the second, 2 for the thid and 1 for the fourth. So there're following schedules


    4\times 3\times 2\times 1=24

Steven Zheng posted 3 years ago

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