2.41 Find the number of ways that 7 teachers can be assigned to 4 sections of an introductory psychology course if no teacher is assigned to more than one section.
Added by Monica G.
Step 1
Step 2 (case A: sections may be empty): For each teacher, there are 4 choices of which section to join, independently. Total ways = 4^7 = 16384. Step 3 (case B: each section must have at least one teacher): We count surjections from the 7 teachers to 4 labeled Show more…
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