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Out of 500 car owners investigated, 400 ...

Out of 500 car owners investigated, 400 owned car A and 200 owned car B, 50 owned both A and B cars. Is this data correct?

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Let `A` be the set of people owned car `A`
Let `B` be the set of people owned car`B`
`n(A)=400`,`n(B)=200`,`n( A nn B)=50`
`n( A uu B)=500..(1)`
...
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