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. 3.5%
• B. 5%
• C. 8.5%
• D. Cannot be determined

Answer 1

The correct option is D Cannot be determined

By zonal theorem:

I+II+III=100%

But only II is known , hence option (d)