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A T.V survey gives the following data fo...

A T.V survey gives the following data for T.V viewing:
`60%` see programme A, `50%` programme B,`50%` programma C,`30%` programmes A and B,`20%` programmes B and C,`30%` programmes A and C, `10%` do not view any programme.
What percent view all the three programmes A,B and C?

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`15%`
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