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In a hostel there are.250 students. 120 ...

In a hostel there are.250 students. 120 watch news channels, 80 watch sports channels and 90 watch music channels. Each channel telecasts the content as per their nature. 50 students watch both news and sports channel 60 students watch both sports and music channel and 65 students watch both news and music channels. What is the maximum number of students who watch all the three types of channels?

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