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In a town of 10000 families, it was foun...

In a town of 10000 families, it was found that 40% families buy newspaper A, 20% families buy newspaper B, 10% families buy newspaper C, 5% families buy A and B, 3% buy B and C and 4% Buy A and C. If 2% families buy all the three newspaper. Find
The number of families which buy none of A, B and C.

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The correct Answer is:
`= 4000`
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