in a group of 20 people, 15 of them speak English, 13 German, and 9 French.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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DISCRETE MATH - Inclusion-exclusion principle, Euler's totient function, permutations
Reaserch has shown that in a group of 20 people, 15 of them speak English, 13 German, and 9 French. Moreover, 10 people speak English and German, 5 English and French, 3 German and French, and 2 people speak all three languages. Prove that this data is falsified.
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