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Question
A survey of 200 people in a community who watched at least one of the three channels – BBC, CNN and DD-showed that 80% of the people watched DD, 22% watched BBC, and 15% watched CNN.
If 5% of people watched DD and CNN. 10% watched DD and BBC, what percentage of people watched all the three channels?
A survey of 200 people in a community who watched at least one of the three channels – BBC, CNN and DD-showed that 80% of the people watched DD, 22% watched BBC, and 15% watched CNN.
If 5% of people watched DD and CNN. 10% watched DD and BBC, what percentage of people watched all the three channels?
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Solution
The correct option is D Cannot be determined
By zonal theorem:
I+II+III=100%
But only II is known , hence option (d)
By zonal theorem:
I+II+III=100%
But only II is known , hence option (d)
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