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black hair or had a whole row to themselves (or both). Of this total, 25 had black hair and 5 were fortunate enough to have a whole row of seats to themselves. How many of the black- haired people had whole rows to themselves? people

black hair or had a whole row to themselves (or both). Of this total, 25 had black hair and 5 were fortunate enough to have a whole row of seats to themselves. How many of the black- haired people had whole rows to themselves? people

Advanced Engineering Mathematics
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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On a particularly boring transatlantic flight, one of the authors amused himself by counting the heads of the people in the seats in front of him. He noticed that all 28 of them either had black hair or had a whole row to themselves (or both). Of this total, 25 had black hair and 5 were fortunate enough to have a whole row of seats to themselves. How many of the black- haired people had whole rows to themselves? people
Transcribed Image Text:On a particularly boring transatlantic flight, one of the authors amused himself by counting the heads of the people in the seats in front of him. He noticed that all 28 of them either had black hair or had a whole row to themselves (or both). Of this total, 25 had black hair and 5 were fortunate enough to have a whole row of seats to themselves. How many of the black- haired people had whole rows to themselves? people
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