On a particularly boring transatlantic flight, one of the authors amused himself by counting the heads...

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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 s

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Answer 1

Answer #1

Let A denote persons with black hair
B denoted persons who have whole row to themselves.

So,
n(AUB) = 28
n(A) = 25
n(B) = 7

Use:
n(AUB) = n(A) + n(B) - n(A^B)
28 = 25 + 7 - n(A^B)
n(A^B) = 32 - 28
= 4

So, 4 people have both black hair and whole row

Answer: 4

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Answer 2

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On a particularly boring transatlantic flight, one of the authors amused himself by counting the heads...

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