Question

Consider the principle

N{A ∪ B} = N{A} + N{B} − N{A ∩ B}.
An interview of 50 women in a residential subdivision reveals that 22 are gardeners while 31 are avid readers. How many are both gardeners and avid readers?

Answer 1

3

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Explanation:

`31+22-50`

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Calculate

`53-50`

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Calculate the sum or difference

`3`

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