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

A T.V. survey gives the following data for T.V. viewing,`60%` see programme x, `50%` programme y, `50%` programme z,`30%` programmes x and y, `20%` programmes y and z,`30%` programmes x and z,`5%` do not view any programme
What percent view at least one of the programmes?

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`95%`
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