The Grinch sneaks into a room with 11 Christmas presents to 11 different people. He proceeds to switch the name-labels on the presents. How many ways could he do this if: a. No present is allowed to end up with its original label? Explain what each term in your answer represents. b. Exactly 5 presents keep their original labels? Explain. c. Exactly 10 presents keep their original labels? Explain.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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The Grinch sneaks into a room with 11 Christmas presents to 11 different people. He proceeds to switch the
name-labels on the presents. How many ways could he do this if:
a. No present is allowed to end up with its original label? Explain what each term in your answer
represents.
b. Exactly 5 presents keep their original labels? Explain.
c. Exactly 10 presents keep their original labels? Explain.
→
A
Transcribed Image Text:The Grinch sneaks into a room with 11 Christmas presents to 11 different people. He proceeds to switch the name-labels on the presents. How many ways could he do this if: a. No present is allowed to end up with its original label? Explain what each term in your answer represents. b. Exactly 5 presents keep their original labels? Explain. c. Exactly 10 presents keep their original labels? Explain. → A
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